Language/Multiple-languages/Culture/Internet-resources-for-polyglots

Free Internet Resources for Polyglots - 2026

Hello polyglots, 😀

Polyglots are individuals who are able to speak multiple languages fluently. With the rise of the internet and technology, there are now numerous online free resources and tools available for polyglots to improve their language skills and connect with other language enthusiasts. This article aims to provide an overview of the most useful internet resources for polyglots, including language learning websites, forums, and social media communities. Whether you are a beginner or a seasoned polyglot, these resources can help you take your language skills to the next level and further your language journey.

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• Links with “!!” are the most important resources for learning English;
• For the condensed version of this article, go HERE.

This page has a child: Language/Multiple-languages/Culture/Internet-resources-for-learning-specific-languages.

Welcome to our lesson on "Multiple-languages Culture → Internet resources for polyglots"! 🌍 In this lesson, we will explore various online resources that can help you enhance your language learning journey and dive deeper into the fascinating world of polyglots. After completing this lesson, you can also check out other related pages, such as our Polyglot Club Team page, where you can learn more about the people behind the scenes who are passionate about multiple languages and cultures.

If you're interested in learning how to study languages more effectively, don't miss our guide on studying with a markup language, which can help you organize your language learning materials in a more structured way. And for those who love video games, we have a special treat for you! Discover how you can explore real-life locations through video games with multiple languages and cultures! 🎮

So, let's dive into the world of polyglots and explore the best internet resources to help you become a true language enthusiast!

-- Introduction --

Advices

This page is updated from time to time, not frequently, not regularly. “But how do I know what you have changed since the last time I come here?” Try this: hover your mouse over “Actions” in the upper right corner of this page, click on “history”, select the current and the version you saw last time, click on “Compare selected versions”.

It would be great if you pay a visit to every site on the list. Don't lose your curiosity.

If you want to do creative work to help others to learn languages and to know about cultures, please visit Language/Multiple-languages/Culture/Productivity-tools-for-polyglots.

It is not recommended to put some banner like “featured in Polyglot Club” on your website, because this list is dynamic.

It is highly recommended to have privacy protections on. There are resources on privacy:

• Awesome Privacy
• Digital Defense
• Privacy Guides

Tips

Some programs require the use of command-line. There is an article about how to do it on Windows. If you want to customise the font in command-line on Windows, you can use ConEmu.

Some programs split words in a sentence with spaces. In this case, texts in Chinese, Japanese, Thai, Vietnamese and other languages need a word segmentation.

To customise the display of webpages, see Greasy Fork to find corresponding tools.

See if you are downloading the binary file or the source code. Unless its language doesn't require compilation, you would need to build the program on your own with the source code. Links to download binaries (built programs) are elsewhere like “Releases” or links in the README.MD file. If you see there are multiple links in “Releases”, select the link with your corresponding operating system, CPU architecture and other clues in its filename. The “amd64” and “x86_64” have minor differences and are usually considered the same when describing a binary. “md5”, “sha256”, “sha512”, etc. are checksum formats, which can be used to check the integrity of the downloaded file. You can use the open-source tool GtkHash to check the integrity of the files with the same name of the checksum files.

If you see SourceForge, you may simply click on the “Download” button. In some cases, the downloaded file is not what you want. Then you need to find it out in “Files”.

If you don't see an executable file in the program, then you may have to compile it and then run it, if the programming language of the program requires it. You may find details on the internet.

JavaScript and some other languages support running something with two programs: a server and a client. You need to start the server, then access the server with the client.

JavaScript programs often utilise Electron.js to have cross-platform support easily, which integrates a Chromium in every program and occupies a lot of resources.

Java relies on a virtual machine, which is an emulator of a computer system and requires some more system resources.

See if the program is updated recently. Outdated programs may be no longer reliable, because they may rely on something else, like another program or a webpage, which can become invalid with the change of time. It may also contain security loopholes that were not discovered at that time and discovered now.

Political activism can motivate people to cause unexpected damage, like node-ipc by RIAEvangelist on GitHub.

Resource Selection Criteria

To be listed on this page, resources should possess at least one of the following characteristics:

1. be rich in FREE content (not just a trial or not fulfilling the need in the free part), and the free content is mostly accurate, and the free content is not all covered by other free ones;
2. be made with a unique, good idea;
3. has no better alternatives.

Resources possessing the following characteristics will be given disadvantage:

1. propagate specific political or religious ideas without possibility of discussion.

Resources with the following features will be given a little priority:

1. available offline;
2. available on multiple platforms;
3. multilingual user interface;
4. lightweight (including “written in C”);
5. open source;
6. privacy-friendly (including “registration not required”).

Blue Light Filter

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https://codeberg.org/fusco/gummy

Filter for Linux. It is open-source.

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https://github.com/LibreShift/red-moon/

Filter for Android. It is open-source.

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https://codeberg.org/ltguillaume/redshift-tray

Filter for Windows. It is open-source.

Dark Mode Enabler

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https://darkreader.org/

Dark mode enabler on browsers. It is open-source.

Reminder

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https://workrave.org/

Rest reminder. It can lock your keyboard and mouse buttons when it is time. It is open-source.

➡ Write a review

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https://github.com/AllanChain/sane-break

Reminder with notice in advance. It is open-source.

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https://gitlab.com/axet/android-hourly-reminder

Repeating timer. It alarms every hour or even minute. This reminds you how a minute passes by. It is open-source.

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https://bdt.jepfa.de/

Reminder for equal slices of time on Android. It is open-source.

Work-Break Timer

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https://github.com/vjousse/pomodorolm

Work-break timer on desktop. It is open-source.

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https://github.com/ayoisaiah/focus

Work-break timer in command-line. It is open-source.

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https://github.com/adrcotfas/Goodtime

Work-break timer with statistics on Android. It is open-source.

Activity Tracker

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https://activitywatch.net/

Program usage tracker on desktop. It is open-source.

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https://whph.ahmetcetinkaya.me/

Program usage tracker, task manager, habit tracker on Android, Windows, Linux. It is open-source.

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https://github.com/appstome/timetome-app

Non-stop activity tracker on Android. It is open-source.

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https://codito.github.io/habito/

Habit tracker in command-line. It is open-source.

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https://github.com/SamAmco/track-and-graph

Habit tracker with graphs on Android. It is open-source.

Progress Bar

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https://github.com/h8moss/progressive

Progress bar on Windows. It is open-source.

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https://github.com/mattvchandler/progressbars

Progress bar on Android. It is open-source.

Self-Control Helper

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https://launchpad.net/timekpr-next

Operating system running time limiter on Linux. It is open-source.

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https://timelimit.io/

Program running time limiter on Android. It is open-source.

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https://github.com/flxapps/DetoxDroid

Several measures to reduce screen attractiveness on Android. It is open-source.

It can be downloaded from F-droid.

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https://www.proginosko.com/leechblock/

Website blocker on browsers. It is open-source.

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https://selfcontrolapp.com/

Website blocker on macOS. It is open-source.

DNS Blocklist

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https://github.com/hagezi/dns-blocklists

Blocklists. It is open-source.

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https://github.com/EnergizedProtection/block

Blocklists. It is open-source.

DNS Blocker

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https://safing.io/

Firewall for blocking Internet traffic for Desktop. It is open-source.

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https://github.com/anfragment/zen

Internet traffic filter list on desktop. It is open-source.

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https://rethinkdns.com/

Firewall for blocking Internet traffic on Android. It is open-source.

Sound Effect

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https://pixabay.com/sound-effects/

Sound effects. Turn loop on and enjoy. Its works are under a public license.

Sound Effect Player

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https://github.com/rafaelmardojai/blanket

Player that plays multiple audio files simultaneously on Linux. It is open-source.

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https://github.com/CliffracerMerchant/SoundAura

Player that plays multiple audio files simultaneously on Android. It is open-source.

Binaural Beat Generator

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https://github.com/Mr-Kumar-Abhishek/brain-beats

Binaural beats generator on desktop. It is open-source.

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https://gitlab.com/axet/android-binaural-beats

Binaural beats generator on Android. It is open-source.

Meditation Helper

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https://sites.google.com/view/jithware

Meditation helper with breath control on Android. It is open-source.

Keyboard Layout

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https://colemak.com/

This one supports a lot of languages in Latin script, but it means to learn typing again. It is worth it. You may have noticed that “Kolemak” is even better than Colemak. How to modify keyboards will be discussed below.

Here is a collection of layout images.

Note that the download link on the home page is “Caps Lock Unchanged”. The idea of replacing Caps Lock with Backspace is great because of its convenience to press Backspace, but having it unchanged is generally better because it's punitive to press Backspace, urging you to make fewer misspellings.

There are locale variants.

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https://bepo.fr/wiki/Accueil

Layout based on French, giving consideration to European languages. But if you don't type French much, it might be not ideal.

No English translation for this site, but it doesn't matter, because this keyboard is generally pre-installed in common operating systems. You just need to find it in the “French” section of keyboard settings.

Keyboard Program

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https://play.google.com/store/apps/details?id=kl.ime.oh

It is lightweight and supports many languages, with many keyboard layouts. But it has problems, such as poor Japanese support.

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https://github.com/Helium314/HeliBoard

Keyboard on Android with initial CJKV support. It is open-source.

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https://florisboard.org/

Keyboard on Android with CJKV support in its beta version. It is open-source.

Typing Program

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https://github.com/max-niederman/ttyper

Typing program in command-line with detailed statistics and missed-word practice in command-line. It is open-source.

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https://github.com/bloznelis/typioca

Typing program in command-line with a time limit in command-line. It is open-source.

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https://github.com/Mithil467/mitype

Typing program with replay of your typing session in command-line. It is open-source.

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https://github.com/plu5/retype

Typing program with EPUB format support in command-line. It is open-source.

File Manager

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https://doublecmd.sourceforge.io/

File manager with two panels and various features. It is open-source.

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https://github.com/sxyazi/yazi

File manager in command-line. It is open-source.

Launcher

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https://albertlauncher.github.io/

Launcher on Linux. It is open-source.

Searcher

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https://github.com/sharkdp/fd

Find local files in command-line. It is open-source.

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https://github.com/phiresky/ripgrep-all

Find texts in local files in command-line. It is open-source.

Text Editor

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https://www.geany.org/

Text editor with features like replacing text in multiple files. It is open-source.

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http://lapce.dev/

Text editor with plugins. Input methods like Fcitx not supported yet. It is open-source.

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https://github.com/gsantner/markor

Text editor with markdown and todo.txt supports on Android. It even has a “speed read” function. It is open-source.

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https://micro-editor.github.io/

Simple text editor in command-line. It is open-source.

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https://neovim.io/

Text editor in command-line with modes and plugins. It is open-source.

A configuration like LazyVim is recommended.

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https://github.com/helix-editor/helix

Text editor in command-line with modes. It is open-source.

Terminal Emulator

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https://alacritty.org/

Terminal with high performance and correct Unicode support. It is open-source.

Spreadsheet

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https://www.marktyler.org/ced/

Minimal spreadsheet program. It is open-source.

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https://github.com/wfxr/csview

Spreadsheet viewer in command-line. It is open-source.

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https://github.com/jqnatividad/qsv

Spreadsheet tool in command-line. It is open-source.

Shortcut

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https://en.wikipedia.org/wiki/Table_of_keyboard_shortcuts

Keyboard shortcuts in general.

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https://defkey.com/

Keyboard shortcuts for specific programs. Add “?pdfOptions=True” to the end of address to download its PDF.

Cheat Sheet

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https://cheatography.com/

Cheat sheets for programs.

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https://github.com/gnebbia/kb

Knowledge base of commands in command-line. It is open-source.

Knowledge Base

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https://xwmx.github.io/nb/

Knowledge management in command-line. It is open-source.

Task Planner

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https://www.abstractspoon.com/

Versatile task planner on desktop. It is open-source.

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https://github.com/alainm23/planify

Task planner on Linux. It is open-source.

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https://github.com/v1tzor/TimePlanner

Task planner on Android. It is open-source.

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https://taskwarrior.org/

Task planner in command-line. It is open-source.

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https://github.com/Sztorm/NoteCalendar

Note calendar. It is open-source.

To-Do-List

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https://super-productivity.com/

To-do-list with a pomodoro timer. It is open-source.

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https://github.com/ransome1/sleek

To-do-list based on todo.txt. It is open-source.

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https://github.com/kraanzu/dooit

To-do-list in command-line with TUI. It is open-source.

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https://tasks.org/

To-do-list on Android. It is open-source.

Task Calendar

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https://eck.cologne/peafactory/en/html/calendar_pea.html

Task calendar with encryption on desktop. It is open-source.

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https://github.com/Etar-Group/Etar-Calendar

Task calendar on Android. It is open-source.

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https://github.com/anufrievroman/calcure

Simple task planner in command-line. It is open-source.

Timeblocker

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https://github.com/ribeirompl/144_blocks

Day planer that divides a day into 144 blocks. It is open-source.

Kanban

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https://github.com/Zaloog/kanban-python

Kanban in command-line. It is open-source.

Notebook

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https://logseq.com/

Knowledge manager with graphic view of nodes and flashcards. It has plugins including adding Anki Flashcards. It is open-source.

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https://github.com/TriliumNext/Trilium

Advanced notebook with hierarchy, text formatting, link map, synchronization and encryption. Good for working. It is open-source.

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https://github.com/pbek/QOwnNotes

Notes and Todos. It is open-source.

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https://www.giuspen.com/cherrytree/

Hierarchical notebook with encryption. It is open-source.

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https://eck.cologne/peafactory/en/html/notebook_pea.html

Write RTF files with encryption. It is open-source.

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https://quillpad.github.io/

Simple note-taking app for Android. It is open-source.

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https://github.com/appml/neutrinote

Note-taking app that supports LaTeX and ASCII drawing on Android. It is open-source.

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https://github.com/YangDai2003/Kori

Note-taking app on Android with Markdown, LaTeX and Mermaid support. It is open-source.

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https://jrnl.sh/

Notes in command-line. It is open-source.

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https://github.com/AmmarAbouZor/tui-journal

Journal in command-line. It is open-source.

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https://orgmode.org/

Notebook for Emacs, Neovim and other text editors. It is open-source.

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https://gitlab.com/ferreum/pto

Plain Text that can be activated at the lock-screen on Android. It is open-source.

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https://postkevone.github.io/tiddlyresearch/

Notebook for Tiddly Wiki. It is open-source.

Handwriting Notebook

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https://xournalpp.github.io/

Handwritten note editor. It is open-source.

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https://saber.adil.hanney.org/

Note with handwriting. It is open-source.

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https://rnote.flxzt.net/

Handwriting program. It is open-source.

Audio Notebook

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https://certified84.github.io/AudioNote/

Audio notebook on Andriod. It is open-source.

Whiteboard

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https://github.com/excalidraw/excalidraw

Online whiteboard. It is open-source.

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https://tldraw.dev/

Online whiteboard. It is open-source.

Wiki

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https://www.dokuwiki.org/dokuwiki

Wiki with many add-ons. It is open-source.

It requires setting up a server.

It has an open-source viewer for Android.

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https://tiddlywiki.com/

Non-linear Wiki on web with HTML files. It is open-source.

Not ideal if the file is large. If the file is large, that means each time you modify and save it, it writes another large file.

It has an open-source viewer for Android.

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https://www.zim-wiki.org/

Simple wiki. It is open-source.

Diary

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https://rednotebook.app/

Diary for desktop. It is open-source.

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https://billthefarmer.github.io/diary/

Diary for Android. It is open-source.

Diagram

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https://www.diagrams.net/

Diagrams. It is open-source.

Timeline

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http://thetimelineproj.sourceforge.net/

Timeline. It is open-source.

Mind Map

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https://www.insilmaril.de/vym/

Mind map with not many and not few features. It is open-source.

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https://github.com/juzzlin/Heimer

Simple and intuitive mind map. It is open-source.

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https://markmap.js.org/

Markdown mind map with VSCodium / VS Code support. It is open-source.

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http://tiddlymap.org/

Mind map for Tiddly Wiki. It is open-source.

Hierarchical Spreadsheet

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https://strlen.com/treesheets/

It combines mind map, spreadsheet and other forms of data. It is open-source.

A video about it.

Graph

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https://foambubble.github.io/

Graph for VSCodium and VSCode. It is open-source.

Media Management

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https://www.tagspaces.org/

File tagging. It is open-source.

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https://calibre-ebook.com/

E-Book manager. It is open-source.

The main drawback is it has to keep a copy of your book in a central directory, which will cause duplication if you also keep the book elsewhere.

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https://github.com/mateusz-bak/openreads-android

E-Book tracker on Android. It is open-source.

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https://hydrusnetwork.github.io/hydrus/

Local image board on desktop. It is open-source.

Web Table Extraction

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https://www.libreoffice.org/

Office suite with spreadsheet that can capture web tables. It is open-source.

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https://merribithouse.net/copytables/

Capture tables from webpages for Chrome and Safari. It is open-source.

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https://github.com/nirantak/copytables

Fork of Copytables for Firefox. It is open-source.

Logic

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https://forallx.openlogicproject.org/

Book edited by different groups of people. Its work is under a public license.

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https://www.logicmatters.net/tyl/

Book, conditioned distribution allowed.

Large Language Model

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 !! https://www.deepseek.com/

One of the top open AI models online. It is open-source.

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 !! https://chat.qwenlm.ai/

One of the top open AI models online. It is open-source.

Large Language Model Client

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 !! https://ollama.com/

Client for offline models in command-line. It is open-source.

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 !! https://www.cherry-ai.com/

GUI for online and offline models. It is open-source.

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 !! https://pageassist.xyz/

Browser addon that relies on Ollama. It is open-source.

International Phonetic Alphabet

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https://www.internationalphoneticassociation.org/

The site of the maker. The full IPA chart can be downloaded here. There is also a link to an interactive IPA chart.

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https://easypronunciation.com/en/ipa-phonetic-transcription-converters

IPA and romanization transcriptions. Very detailed, but there is a limitation for each hour. Its “More Tools” is also noteworthy.

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https://github.com/dmort27/epitran/

Transcription to IPA. It is open-source. It won't help if you don't know Python.

It only supports words, as is discussed. Somebody can develop a tool for sound change.

Pronunciation

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 !! https://lingualibre.org/

Pronunciation data from Wikimedia Commons. Its work is under a public license.

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 !! https://forvo.com/

Dictionary of pronunciation.

➡ Write a review

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https://phoible.org/

Phonological data. Its work is under a public license.

Course

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https://fsi-languages.yojik.eu/

Mainly courses of Foreign Service Institute, Defense Language Institute, Peace-Corps. FSI is initially aimed at middle-aged officials, so maybe not everyone likes it. Its work is partly in public domain.

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https://www.coursera.org/browse/language-learning/

Some super cool courses. This is suggested by RomDasha.

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 !! https://www.lingolia.com/

A little site with useful basic courses of 5 languages with good design.

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https://en.wikibooks.org/wiki/Subject:Languages

Books are mostly incomplete and in lack of update, but some are nearly completed or completed, not bad.

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https://ikindalikelanguages.com/

Introductions to languages.

Speaking

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 !! https://youglish.com/

Pronunciation from videos, with a large subtitle frame.

It is better to be used together with the Chromium or Chrome extension Separate Window.

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https://speechling.com/

Submit the recording and wait for the response. Supported languages are not many.

➡ Write a review

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https://ivypanda.com/tongue-twisters

Try not to hurt yourself when practising.

It covers an older site and has improved a lot. There's no copyright affair involved because such a list is not a “creative work”.

You may want to ask if this page is protected by copyright. All my comments are protected, the list of links like the one in that brief version is not.

Flashcard

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 !! https://apps.ankiweb.net/

Offline flashcard platform. You can find its manual at “Docs” on the website. Content can be rendered in HTML and CSS. It is open-source.

Unfortunately, not free on iOS.

Related resources:

Shared Decks

Add-ons

External Programs

Beginner Tutorial

TSV Creation

Web Scrapping

Markup Studying

There is also a section of an article on flashcards.

There is an infamous issue of it: if you add or delete fields in a note type, you have to upload all your data when syncronising. Also expect Bazel, which it utilises to cause troubles.

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https://mnemosyne-proj.org/

Flashcards with basic functions. It is open-source.

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https://github.com/abeleinin/goki

Flashcards in command-line through TSV or CSV files with ChatGPT support. It is open-source.

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https://github.com/proycon/vocage

Minimalistic flashcards in command-line through TSV files. It is open-source.

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https://www.memcode.com/

Flashcards on web. It is open-source.

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https://github.com/FilippVolodin/ReeePlayer

Flashcard with video clips. It is open-source.

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https://github.com/alyssaxuu/carden

Chromium/Chrome addon. It is open-source.

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https://github.com/tema6120/ForgetMeNot

Flashcard program for Android. More advanced than AnkiDroid in many aspects, including necessary instructions. You can even set intervals for the spaced repetition. It is open-source.

➡ Write a review

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https://github.com/rh-id/a-flash-deck

Flashcards with notification on Android. It is open-source.

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https://tadeas.dev/twsr/

Flashcard for Tiddly Wiki. It is open-source.

Presentation

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https://codeberg.org/GrimPixel/Fountain

Presentation with TSV in command-line. It is open-source.

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https://maaslalani.com/slides/

Presentation with Markdown in command-line. It is open-source.

Wallpaper

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https://peterlevi.com/variety/

Wallpaper changer for Linux. It is open-source.

It has “quotes”, which can be used as the flashcard. An example is variety-german-words. To customise its code:

In “german_words.py”

• Search and find “data = ”, change its structure;
• Replace “reader(fin)” to “reader(file, delimiter="\t")” to support TSV;

In “words.csv”, change its content.

Danmaku

---

https://github.com/luyuhuang/DWords2

Shoot entries on the screen. It is open-source.

Vocabulary

---

 !! https://context.reverso.net/translation/

Among its products, the mobile version of Context seems to be the most helpful: learn and practise new words with example sentences.

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 !! https://babadum.com/

It's pretty good for educating young polyglots.

➡ Write a review

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 !! https://github.com/tkrajina/10000sentences

Sentences from Tatoeba to practice. It is aesthetically same with Anki (I mean copy-paste). It is open-source.

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 !! https://www.clozemaster.com/

Learn with cloze. It is effective, but sometimes it is just repeating the same point in different questions. Also, synonyms are not supported.

➡ Write a review

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https://www.languageguide.org/

Some basic vocabulary.

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https://babadada.com/

Visual dictionary. No grammatical genders or pronunciation, suitable for reviewing.

A lot of languages has not been completed yet, without any notice. Also, look out for polyseme mistakes.

➡ Write a review

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https://trielingual.com/

See the related phrases of a word. It is open-source.

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https://en.wiktionary.org/wiki/Appendix:Swadesh_lists

Swadesh lists are basic vocabulary, initially for linguistic use. But it can be the starting point of vocabulary building for language learners as well.

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https://en.wiktionary.org/wiki/Wiktionary:Frequency_lists

Frequency lists. Make use of it with programs that help to memorise, such as Anki.

If you seriously want to learn a language, and there are no ready-made free flashcards reaching the native level, and you don't want to spend money, this may be the most effective way to memorise words.

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https://github.com/frekwencja/most-common-words-multilingual

Word frequency of top 5000 words.

---

https://github.com/rspeer/wordfreq

Word frequency tool for Python. It is open-source.

Vocabulary Builder

---

 !! https://github.com/jzohrab/lute-v3

Build vocabulary list by adding definitions to words on texts. It is open-source.

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 !! https://github.com/simjanos-dev/LinguaCafe

Build voocabulary lists for some languages on local web. It is open-source.

---

 !! https://vocabhunter.github.io/

Find unfamiliar words in a document. Great for getting familiar with all words in a document before reading. Better to disable the filter. It is open-source.

---

 !! https://github.com/FreeLanguageTools/vocabsieve

Analyse the sentence, find the vocabulary and create Anki flashcards. It is open-source.

---

 !! https://github.com/geajack/Wordology

Browser add-on for building vocabulary. It is open-source.

Available for Chromium and Firefox.

---

https://github.com/xxyzz/WordDumb

Footnote creator for e-books. It is open-source.

Etymology

---

https://etymologeek.com/

Etymology in European languages.

Language Game

---

https://sourceforge.net/projects/scrabble/

Scrabble. It is open-source.

---

https://gottcode.org/tanglet/

Boggle. It is open-source.

---

https://gottcode.org/connectagram/

Connectagram. It is open-source.

---

https://gitlab.gnome.org/jrb/crosswords

Crossword on Linux. It is open-source.

---

https://github.com/lexica/lexica

Game of finding words on Android. It is open-source.

---

https://billthefarmer.github.io/gurgle/

A word game on Android. It is open-source.

---

https://billthefarmer.github.io/gridle/

A word game on Android. It is open-source.

---

https://github.com/Magoninho/word-search-puzzle-generator

Word search game on command-line. It is open-source.

To change the letters in the game, modify the list in “alphabet.py”.

---

https://gitlab.com/Hague/forkyz

Crosswords on Android. It is open-source.

---

https://github.com/devarshi16/HangMan

Hangman. It is open-source.

Its data is at “hangmanultimate/data.py”.

---

https://gemelo.org/grabagram/

Anagram on mobile. It is open-source. Code at its github repository.

Quiz

---

https://github.com/Yvee1/hascard

Quizzes in Markdown files in command-line. It is open-source.

---

https://github.com/ismet55555/exam-terminal

Quizzes in YAML files in command-line. It is open-source.

You may need to enter full-screen mode, otherwise the program won't work for not having enough space.

---

https://github.com/JeromeSchmied/crablit

Quizzes TSV or other files in command-line. It is open-source.

---

https://codeberg.org/GrimPixel/Quiz_Grid

Generate HTML tooltip quiz from TSV files. It is open-source.

Test

---

https://lingua.com/

A few materials for beginners. Better treat it as your proficiency tests instead of learning materials because it's not much.

➡ Write a review

---

https://www.transparent.com/language-resources/tests.html

Test your proficiency.

There is only one set of test for each language. Don't search the meanings of the words you don't know if you want to take this test again later.

---

https://www.arealme.com/vocabulary-size-test/en/

For testing your vocabulary size.

There is only one set of test for each language. Don't search the meanings of the words you don't know if you want to take this test again later.

---

https://www.ezglot.com/vocabulary-test.php

Test your vocabulary size. It's faster and maybe not so accurate. The result is at an inconspicuous corner.

Reader

---

https://gitlab.com/coolreader-ng/crqt-ng

Reader for several formats with double page view on desktops. It is open-source.

---

https://mupdf.com/

Lightweight PDF reader on desktops. It is open-source.

Type “man mupdf” in command-line to see its shortcuts.

---

https://www.sumatrapdfreader.org/

PDF reader on Windows. Dark mode and Annotation are available. It is open-source.

---

https://github.com/max-kammerer/orion-viewer

PDF reader on Android. It is open-source.

---

https://johnfactotum.github.io/foliate/

Reader on Linux with features like layout and online translation. It is open-source.

---

https://librera.mobi/

Reader on Android. It is open-source.

---

https://koreader.rocks/

Reader with a simple user interface on Android. It is open-source.

---

https://www.kiwix.org/

Reader of Wikipedia and some other sites offline. It is open-source.

PDF Editor

---

https://jakubmelka.github.io/

PDF editor. It is open-source.

Feed

---

https://www.feedflow.dev/

Simple feeder. It is open-source.

---

https://github.com/martinrotter/rssguard

Feeder for desktop. It is open-source.

---

https://newsboat.org/

Feeder in command-line. It is open-source.

---

https://github.com/readrops/Readrops

Feeder for Android. It is open-source.

---

https://greasyfork.org/en/scripts/373252-rss-show-site-all-rss

User script for showing feeds of a website. It is open-source.

Image Viewer

---

https://github.com/nomacs/nomacs

Image viewer. It is open-source.

---

https://github.com/atanunq/viu

Image viewer in command-line. It is open-source.

Webpage Tool

---

https://tabsets.web.app/

Group tabs in sets. It is open source.

---

https://github.com/danny0838/webscrapbook

Browser extension for batch downloading web pages. It is open-source.

---

https://github.com/gildas-lormeau/SingleFile

Save the web page as a single file. It is open-source.

---

https://github.com/lapwat/papeer

Save webpages in different formats in command-line. It is open-source.

---

https://github.com/OlegWock/anori

Browser extension for customised new tab with Anki support. It is open-source.

---

https://github.com/zimocode/smartupGesturefy

Gestures for some Browsers. It is open-source.

---

https://floccus.org/

Synchronise bookmarks. It is open-source.

Speed Reader

---

https://github.com/Darazaki/Spedread

Reading speed trainer for Linux. It is open-source.

---

https://github.com/pasky/speedread

Reading speed trainer. Perl is required. It is open-source.

---

https://github.com/nemanjan00/uniread

Speed reader with e-book support. It is open-source.

---

https://github.com/Quantum-mutnauQ/Fast_Reader_GTK

Speed reader for Linux. It is open-source.

---

https://github.com/jamestomasino/stutter-android/

Speed reader for Android. It is open-source.

---

https://comfortreader.rhizomaticdesign.net/

Streaming reader for Android. It is open-source.

---

https://github.com/FP22FD/auto-scroll-down-chrome-extension

Autoscrolling for Chromium/Chrome. Good for practising reading speed.

---

https://github.com/hisakaz0/AutoScrolling

Autoscrolling for Firefox. Good for practising reading speed. It is open-source.

Book Catalogue

---

https://github.com/tfonteyn/NeverTooManyBooks

Book catalogue on Android. It is open-source.

Reading Material

---

https://wikisource.org/wiki/Main_Page

Literature in public domain. They can be downloaded.

---

https://www.gutenberg.org/

The largest collections of books in the public domain, mostly in English, though.

Android app for downloading books is available at Myne.

There is a book catalogue website with ever-changing domain names: LibGen, which contains a wider range of books. Make sure you don't see any strange link there. It is also available on Android.

Writing

---

https://owl.excelsior.edu/

It is not for learning languages, but for how to write and read. Its work is under a public license.

It is teaching about English, so something does not apply to some other languages.

---

https://owl.purdue.edu/owl/purdue_owl.html

Another online writing lab.

---

https://www.theologeek.ch/manuskript/

Tool for writing stuff. It is open-source.

---

https://github.com/Wavesonics/hammer-editor

Tool for writing on Android. It is open-source.

---

https://github.com/Wavesonics/hammer-editor

Corrector of minor typos. It is open-source.

Dictionary

---

 !! https://www.wiktionary.org/

Practical, no need to switch dictionaries, translations in many languages are shown together.

there is a parser for its data. Extracted JSON data are also available.

---

 !! https://www.wordreference.com/

It is really completed.

---

 !! https://www.linguee.com/

It is completed, with example sentences of high quality. You can even find uncommon words with meanings of common words.

---

 !! https://bab.la/

It is completed for several languages.

---

 !! https://iate.europa.eu/

Terminology dictionary of European Union. That is to say, what you search should be a term.

---

https://glosbe.com/

It supports a lot of languages, citing results from several corpora. It is somehow messy and in many cases inaccurate, but if the dictionaries listed above have no result about a word, this one may help.

Dictionary Client

---

 !! https://xiaoyifang.github.io/goldendict-ng/

It supports online and offline dictionaries, based on GoldenDict. It is open-source.

You can search the word by selecting it and listen to Forvo pronunciation. You can also add dictionary websites.

---

 !! https://github.com/farfromrefug/OSS-Dict

Offline dictionary in SLOB format. It is open-source.

---

 !! https://github.com/pnlpal/dictionaries

Browser add-on with clear results and can export to Anki decks. It is open-source.

---

 !! https://mouse-dictionary.netlify.app/

Browser add-on for searching local dictionary files. It is open-source.

To convert dictionary text files into TSV format, see this article. The files at “mouse-dictionary/data/rule/” will need to be edited as well.

---

https://crissium.github.io/SilverDict/

Web version of GoldenDict. It is open-source.

Dictionary Tool

---

 !! https://codeberg.org/GrimPixel/Text_to_Phrase_List

Extract words from a text, then attach TSV or JSONL dictionary entries in command-line. It is open-source.

Towards TSV may be required for converting dictionaries in EDICT2 format to TSV format.

kaikki.org provides Wiktionary data converted to JSONL format. For Chinese language, open-source tool Transliteration may be required to convert words from Simplified variant to Traditional variant.

Translation

---

https://github.com/davidventura/firefox-translator

Offline translator on Android. It is open-source.

---

https://invent.kde.org/office/crow-translate

Translator with multiple engine support. It is open-source.

---

https://pot-app.com/

Translator with multiple engine support and plugins. It is open-source.

---

https://www.soimort.org/translate-shell/

Command-line translator from different sources. It is open-source.

---

https://github.com/Bnyro/TranslateYou

Translator for Android. It is open-source.

---

https://www.readfrog.app/

Translation of webpages in parallel text on browsers. It is open-source.

---

https://linguister.io/

Webpage translation on browsers with history and exportable bookmarks. It is open-source.

---

https://github.com/ttop32/MouseTooltipTranslator

Translator for Chromium and other browsers with mouse hovering. It is open-source.

This extension sets AltGr key to translate.

Interpretation

---

https://codeberg.org/GrimPixel/STTS

Aggregated speech-to-text, translation, text-to-speech. It is open-source.

Transliteration

---

https://codeberg.org/GrimPixel/Transliteration

Transliterator. It is at the beginning phase. It is open-source.

Conjugation

---

 !! https://cooljugator.com/

Conjugation and some declension.

---

 !! https://www.verbix.com/

Conjugation.

Gender

---

http://www.passion4teq.com/apps/

Apps for practising genders in 4 languages. You can also estimate how long you can practice until your battery goes empty.

Number

---

https://codeberg.org/GrimPixel/Numeration

Program to practise reading numbers. It is open-source.

In progress. It can see major progresses during school holidays. Introduction: Language/Multiple-languages/Vocabulary/Numeration-Tutorial.

➡ Write a review

---

https://www.languagesandnumbers.com/numbering-systems/

Rules of writing numbers, more concise than Wikipedia's entries.

Grammar Checker

---

https://languagetool.org/

It supports several languages, but works well on the few. It is open-source.

A video about the rule editor.

Audio Player

---

https://audacious-media-player.org/

Lightweight audio player for desktops. It is open-source.

---

https://www.strawberrymusicplayer.org/

Audio manager with many features. It is open-source.

---

https://quodlibet.readthedocs.io/

Simple audio manager. It is open-source.

---

https://github.com/FossifyOrg/Music-Player

Audio player with speed control, tap on the time to jump 10 seconds on Android. It is open-source.

---

https://musikcube.com/

Audio player in command-line. It is open-source.

Video Player

---

https://mpv.io/

Video player with fast response. It is open-source.

---

https://www.smplayer.info/

It is a frontend of MPlayer and can display two subtitles. It is open-source.

What a good name of this program.

---

https://github.com/moneytoo/Player

Video player for Android. It is open-source.

Listening Material

---

 !! https://www.listeningpractice.org/

To practice listening. Voices are from volunteers and their qualities vary. It also has conjugation exercises. Its work is under public licenses.

If your browser doesn't play the audio automatically, then you need to grant the website the autoplay permission (next to the URL in Firefox).

---

https://globalstorybooks.net/

Stories in many languages translated from African Storybook. Its work is under a public license.

---

https://www.easy-languages.org/

Street interview videos with embedded subtitles. Real and fun.

The first time I watch a video, I was busy picking up the unknown words; the second time, I understood the sentences; the third time, I got an impression what kind of person the interviewee is.

---

https://librivox.org/

Books read by volunteers. Its work is under public licenses.

---

https://lyricstraining.com/

Listen to songs and fill in the blanks of lyrics.

---

https://www.captionpop.com/

Watch videos and learn with subtitles.

---

https://lingualibre.org/

Recordings. Its work is under a public license.

---

https://rhinospike.com/

Recordings.

---

https://audio-lingua.ac-versailles.fr/

Listening materials with CEFRL levels. Its work is under public licenses.

It doesn't have transcripts, so speech-recognition is required.

Audio & Video Tool

---

https://tenacityaudio.org/

For audio edit, as well as training your pronunciation by comparing your own voice with the recording you were imitating. Fork of Audacity without potential privacy violation. It is open-source.

There are videos about checking your pronunciation, practising dialogues on your own, recording computer audio, labeling audio positions.

---

https://obsproject.com/

When you are playing games in the languages you are learning, it is often hard to focus on the voices and subtitles without failing your goals in the games. You can solve this problem by recording your gameplay with this program. It is open-source.

---

https://www.fon.hum.uva.nl/praat/

With this one, you can say you are “studying” pronunciation.

A little tutorial and a big playlist of various videos.

Text-to-Speech

If you don't know how to get the voices on Windows, you can see Language/Multiple-languages/Culture/How-to-use-SR-and-TTS-on-Windows.

---

 !! https://www.cwu.edu/student-life/student-support/central-access/resources/reader.php

TTS program on Windows and macOS with TTS engines in the operating system. It is open-source.

---

http://www.cross-plus-a.com/balabolka.htm

TTS program on Windows with legacy engine support.

---

 !! https://github.com/Danesprite/tts-util-app

Text-to-Speech for Android. It is open-source.

---

https://readaloud.app/

Browser add-on. It is open-source.

---

https://codeberg.org/GrimPixel/Altering_TTS

A little program to generate audio files with altering TTS voices. It is open-source.

Speech-to-Text

---

 !! https://thewh1teagle.github.io/vibe/

Speech-to-text offline with OpenAI Whisper on desktop. It is open-source.

---

https://github.com/ideasman42/nerd-dictation

Speech-to-text in command-line offline with Vosk on Linux. It is open-source.

---

 !! https://github.com/tosinonikute/NotelyVoice

Speech-to-text offline with OpenAI Whisper on mobile. It is open-source.

---

 !! https://www.speechtexter.com/

Speech-to-text online powered by Google.

Example Sentence

---

 !! https://tatoeba.org/

Example sentences in many languages. Its work is under public licenses.

Don't forget to try searching in both directions. You can not only see the meaning of a sentence, but also try to translate a sentence into the language you are learning and see how you did.

If you want to translate, please translate sentences with audio first, because the translations may appear on sites which provide translations of audio.

---

https://deskell.sketchengine.co.uk/

Sketch from a large of text corpus.

Parallel Text

---

 !! https://weblate.org/

Website for localisation. You can easily find parallel texts. It is open-source.

---

http://sublearning.com/

Subtitles in parallel. Sometimes the selected lines don't match because the sentences are not complete. Sometimes there are mistakes in subtitles.

---

https://www.manualslib.com/

Manuals. Some of them are in multiple languages. You can also find their German, Spanish, French domains at the bottom of the page.

Parse Tree

---

https://sourceforge.net/projects/treeform/

A tool to draw parse trees and have a better understanding of sentence structures. It is open-source.

A video about it.

---

https://ltc.sourceforge.io/

A different one to draw parse trees. It is open-source.

---

https://codeberg.org/GrimPixel/Parse_Forest

Program in command-line to draw parse trees from a TXT file to a HTML file. It is open-source.

Text Memorization

---

https://codeberg.org/GrimPixel/Cloze_Test

Take cloze tests from texts, sentence by sentence. It is open-source.

Phrasebook

---

 !! https://www.funeasylearn.com/

It provides apps for both phrase and vocabulary.

---

https://www.loecsen.com/

It supports many languages, and it is detailed.

---

https://www.50languages.com/

Actually a few more than 50 languages. You can also have a test there.

Calendar & Clock

---

https://github.com/PaskoZhelev/holidayz-app

View holidays on Android. It is open-source.

It can also be downloaded from F-Droid.

---

https://theknight.co.uk/

Clock widget on Linux. It is open-source.

---

https://www.timeanddate.com/

It has not only the world clock for every city, but also many other features, such as calendars with festivals of most countries.

Weather

---

https://github.com/chubin/wttr.in

Weather program in command-line. It is open-source.

---

https://github.com/woheller69/omweather

Weather program for Android. It is open-source.

---

https://www.ventusky.com/

A lot of things about meteorology.

---

https://earth.nullschool.net/

Wind, weather, ocean conditions.

---

https://waqi.info/

Air condition around the world.

Community

---

https://www.italki.com/

The most popular language learning community by now. It also pushes helpful articles written by teachers.

---

https://www.tolearnfree.com/free-educational-sites.php

The design of the webpages is old-fashioned, but it has a lot of content, including little tests.

Its French version has something more.

---

https://polyglotclub.com/

There are some rare features of it, such as Wiki lessons, Events. It adopts ISO 639-3, almost every language is included here.

Forum

---

https://hinative.com/

Ask and answer with people around the world.

In some channels, questions are too many, answer rates are low. Try asking at Polyglot Club.

Ask in parallel text in case the respondent doesn't understand your formulation.

---

https://stackexchange.com/sites#culturerecreation

One of the most popular Q&A site.

Language Exchange

---

https://conversationexchange.com/

Find language exchange partners online.

---

https://www.lingbe.com/

Talking with people.

---

https://mylanguageexchange.com/

Free users can be contacted by those who have paid. Since they have paid, they are more likely to be serious learners.

---

https://cryptpad.fr/

Cloud office suit. Zero knowledge. It is open-source.

It's also great for language partners to do something together.

Chat

---

https://pidgin.im/

Chat client that supports multiple protocols through plug-ins. It is open-source.

---

https://gajim.org/

XMPP client on desktop. It is open-source.

---

https://codeberg.org/iNPUTmice/Conversations

XMPP client on Android. It is open-source.

---

https://github.com/paulfariello/aparte

XMPP client in command-line. It is open-source.

---

https://github.com/SrainApp/srain

IRC client on desktop. It is open-source.

---

https://github.com/osa1/tiny

IRC client in command-line. It is open-source.

Blog

---

https://blogs.transparent.com/

There are periodically good contents being presented.

---

https://www.thoughtco.com/languages-4133094

Languages are fewer than Transparent's, and so do the update frequency. But its quality is still high.

Lyrics

---

https://www.musixmatch.com/

Lyrics and their translations.

---

https://lyricstranslate.com/

Lyrics and their translations.

Subtitle

---

https://subripper.com/

Download subtitles form many websites.

---

https://www.opensubtitles.org/

One of the most popular subtitle sites. Subtitles in European languages are easier to find.

➡ Write a review

---

https://subscene.com/

One of the most popular subtitle sites. Subtitles in English, Arabic, Persian, Indonesian are easier to find.

---

https://github.com/FunkyMuse/SubHub

Subtitle downloader on Android. It is open-source.

---

https://bonigarcia.github.io/dualsub/index.html

It can help to merge two subtitles. It may crash at the second time. It is open-source.

---

http://subs2srs.sourceforge.net/

Turn subtitles into flashcards. It is open-source.

A video about it.

---

 !! https://github.com/garywill/multi-subs-yt

Display multiple subtitles on YouTube.

---

https://github.com/jdepoix/youtube-transcript-api

YouTube caption downloader in command-line. It is open-source.

News

---

http://www.abyznewslinks.com/

Links to news websites.

Some TV have shows for free, some of which even with subtitles.

Radio & Podcast

---

https://www.radio-browser.info/

A list of internet radio stations.

---

https://github.com/zaps166/QMPlay2

Podcast player for desktop with RadioBrowser support. It is open-source.

---

https://github.com/gilcu3/hullcaster

Podcast client in command-line. It is open-source.

---

https://antennapod.org/

Podcast player for Android with playback speed change and rewind 10s. It is open-source.

---

https://www.listennotes.com/

Search Engine of podcasts.

Live & Video

---

https://github.com/iptv-org/iptv

Database of IPTV stream addresses. It is under a public license.

---

https://codeberg.org/liya/yuki-iptv

IPTV player on desktop. It is open-source.

---

https://brunochanrio.github.io/DangoPlayer/

IPTV player on Android. It is open-source.

---

https://livetvcentral.com/

The most complete list of worldwide online TV channels.

Many links are dead, but the live stream is still available somewhere else in many of these sites.

---

https://www.downthemall.org/

Link and image downloader. It is open-source.

---

https://github.com/yt-dlp/yt-dlp

Video downloader in command-line. It is open-source.

---

https://github.com/mhogomchungu/media-downloader

GUI for command-line video downloader tools. It is open-source.

Language Information

---

https://www.omniglot.com/

It provides information about basic knowledge of many languages. Many “Alphabet and Pronunciation” lessons on this site are from there.

➡ Write a review

---

https://glottolog.org/

Information of languages of the world. Not only languages, but also many varieties. It is open-source. Its work is under a public license.

---

https://www.scriptsource.org/

Information of scripts. Its work is under a public license.

---

https://www.muturzikin.com/countries.htm

Linguistic maps.

---

https://lingvo.info/

General knowledge about European languages.

---

https://iso639-3.sil.org/

Codes for every language and is still being updated. You can find the whole table.

General Knowledge

---

https://www.britannica.com/

A comprehensive encyclopedia.

Educational Resources

---

https://oercommons.org/

Educational resources search engine. Its contents are under public licenses.

---

https://oasis.geneseo.edu/index.php

Educational resources. Its contents are under public licenses.

Map

---

https://www.openstreetmap.org/

Another map site. You can even download them. It is open-source.

There is a video about its modification with Inkscape.

---

https://marble.kde.org/

Alternative to Google Earth. It is open-source.

---

https://www.comaps.app/

Offline maps for mobile with OpenStreetMap data. It is open-source.

---

https://ontheworldmap.com/

Downloadable maps. It even includes cities. I don't expect them to be up-to-date.

National Symbol

---

https://en.wikipedia.org/wiki/Lists_of_national_symbols

Lists of national symbols.

Culture & Travel

---

https://ehrafworldcultures.yale.edu/

Introductions to cultures.

---

https://www.wikivoyage.org/

Introduction of the city and many details of countries. It is open-source.

The most important page for travelers is this.

---

https://culturalatlas.sbs.com.au/

It is about countries and in progress.

---

https://www.commisceo-global.com/country-guides/

It is mainly about some details about manners.

---

https://guide.culturecrossing.net/index.php

It is mainly about some details about manners.

---

https://whc.unesco.org/en/list/

Cultural heritages. There is also an interactive map.

---

https://ich.unesco.org/en/lists/

Intangible cultural heritages.

History

---

https://www.worldhistory.org/

An encyclopedia. Articles, images, videos, 3D images, podcasts and more.

---

http://www.fsmitha.com/

Detailed articles about history.

---

https://play.google.com/store/apps/details?id=com.timleg.historytimeline

An app about major events of history.

---

https://www.hyperhistory.com/online_n2/History_n2/a.html

Basic knowledge of the world history. Good for beginners. Looks old-fashioned, but it is not bad if you get used to it.

---

https://histography.io/

Historical events in dots.

---

https://omniatlas.com/

It shows you some old news with detailed maps.

---

https://www.timemaps.com/

Maps of history.

---

https://worldhist.org/

Map of every year. Names of nations can be searched.

---

https://www.worldhistorymaps.info/

Historical maps. Its works are under a public license.

---

https://www.oldmapsonline.org/

Old maps around the world.

The site has trouble with the mobile site. You need to set to view the desktop site on mobile.

Philosophy & Religion

---

https://plato.stanford.edu/index.html

Stanford Encyclopedia of Philosophy.

---

https://iep.utm.edu/

University of Tennessee at Martin's Encyclopedia of Philosophy.

---

https://www.philosophybasics.com/

The basics of philosophy, “by a layman for the layman”.

---

https://simplyphilosophy.org/

Articles about different aspects of philosophy.

---

http://philosophypages.com/

Resources about philosophy. Its work is under a public license.

---

https://www.learnreligions.com/

Articles about religions.

---

https://slife.org/

An interfaith community with introductions to spiritual topics.

---

https://www.holybooks.com/

Downloadable books about religions.

---

https://en.wikipedia.org/wiki/List_of_religions_and_spiritual_traditions

List of religions and spiritual traditions.

---

https://virtualreligion.net/

Resources about religions.

Mythology

---

https://mythbank.com/

Basics of myths.

---

https://mythopedia.com/

Myth information.

---

https://en.wikipedia.org/wiki/List_of_mythologies

List of mythologies.

Epic

---

https://en.wikipedia.org/wiki/List_of_epic_poems

Epics.

Geography

---

https://www.worldatlas.com/

Short articles.

---

http://worldmapquiz.qbisstudio.com/index.html

An app for practising world map in several languages.

Dependencies are not all included. The form of address in Chinese version is a mixture of PRC's and ROC's, which is not good. For Chinese names of countries, there is a list: Language/Mandarin-chinese/Vocabulary/Countries-and-Nationalities.

---

https://www.geoguessr.com/seterra/

Game of geography, online or with apps.

---

https://www.flagid.org/

Flag identifier.

---

https://worldledaily.com/

Street view quizzes.

---

https://virtualvacation.us/

Street view videos with quizzes.

Music

---

https://folkcloud.com/

Information about folk music.

---

https://www.chosic.com/

Many tools about music, including similar song finder.

---

https://www.soundhound.com/

Recognize music with recording or your hum. It has some advantages over Shazam.

---

https://www.shazam.com/

Recognize music with recording. It has some advantages over Soundhound.

Art

---

https://www.wikiart.org/

All kinds of artwork around the world.

Dance

---

https://en.wikipedia.org/wiki/List_of_ethnic,_regional,_and_folk_dances_by_origin

Dances by origin. You can search for them on video sites.

Cuisine

---

https://www.allrecipes.com/recipes/86/world-cuisine/

A bit of recipes around the world.

---

https://en.wikipedia.org/wiki/List_of_cuisines

List of cuisines.

Tabletop Game

---

https://drwhut.itch.io/tabletop-club

Multiplayer 3D tabletop games. Still incomplete currently. It is open-source.

---

https://pysolfc.sourceforge.io/

Card and tile games. It is open-source.

---

https://www.gnu.org/software/xboard/

Traditional board games. Its user interface is more cruel than AI opponents. It is open-source.

There are pre-installed engines, but they are somehow old. The most versatile engine is Fairy Stockfish.

Cute Chess looks good, but Xiangqi and Janggi are missing.

---

https://www.pychess.org/

Multiplayer platform for playing chess variants.

---

https://vassalengine.org/

Strategy game engine and modules. It is open-source.

---

https://boardgamegeek.com/

Information of board games.

---

https://www.wopc.co.uk/

Playing card patterns.

Folk Costume

---

https://en.wikipedia.org/wiki/Folk_costume

List of folk costume.

Folktale

---

https://fairytalez.com/

Some tales.

---

https://www.worldoftales.com/

Some tale books.

Festival

---

https://en.wikipedia.org/wiki/Category:Lists_of_festivals_by_country

Not complete, but still good.

---

https://www.world-festivals.net/

It includes more countries than the one above. I wonder if it is so difficult to gather information about festivals.

Martial Art

---

https://en.wikipedia.org/wiki/List_of_martial_arts

List of martial arts.

---

https://blackbeltwiki.com/

Introduction to many martial arts.

Name

---

https://en.wikipedia.org/wiki/Lists_of_most_common_surnames

List of the most popular family names.

---

https://en.wikipedia.org/wiki/List_of_most_popular_given_names

List of the most popular given names.

---

https://www.behindthename.com/

Find the meanings of a given name.

Astronomy

---

https://stellarium.org/

You can see the sky in different locations and times. There are starlores in different cultures. Some even have constellation art.

Living Condition

---

https://www.numbeo.com/cost-of-living/

Prices from the world. Sometimes inaccurate.

---

https://www.globalproductprices.com/

The prices of products in different regions. Its work is under a public license.

---

https://www.globalpetrolprices.com/

The prices of energy in different regions. Its work is under a public license.

Economy

---

https://www.exchange-rates.org/

Exchange rates.

---

https://commodity.com/

Basic understanding of trading around the world.

Vehicle

---

https://www.globalcarsbrands.com/

Automobile brands around the world.

Statistics

---

https://www.statista.com/

All kinds of statistical data. Some are free.

---

https://ourworldindata.org/

It has detailed explanation on its data.

Train

---

https://www.seat61.com/

Information about train travels.

Prepaid SIM Card

---

https://prepaid-data-sim-card.fandom.com/wiki/Prepaid_SIM_with_data

Details about SIM cards. Its work is under a public license.

License Plate

---

http://www.worldlicenseplates.com/

Take a look if you are interested. It's completed.

Trivia Quiz

---

https://www.jetpunk.com/

Trivia quizzes of the world. It is available in multiple languages.

Model

---

https://castle-engine.io/view3dscene.php

3D model viewer with support of walking and flying. It is open-source.

---

https://sketchfab.com/

3D models, some of which are under public licenses. Make sure your computer's memory is large enough to view them.

You can also use 3D printers to print them if you like.

Character

---

https://wiki.gnome.org/Apps/Gucharmap

Character map for Linux and macOS. It is open-source.

---

https://leun4m.github.io/symbsearch/

Character search for Windows. It is open-source.

---

https://github.com/Ryosuke839/UnicodePad

Character search for Android. It is open-source.

It is also available on F-droid.

Font

---

https://www.google.com/get/noto/

It presents a lot of fonts in one art style. It is open-source.

---

https://unifoundry.com/unifont/index.html

No one covers more of the Unicode map than GNU Unifont. It is open-source.

Its function is limited, such as bad support for South and Southeast Asian characters.

---

https://www.fontspace.com/

You can go to its “stuff” and search by Unicode characters.

---

https://github.com/sdushantha/fontpreview

Font previewer in command-line. It is open-source.

Optical Character Recognition

---

https://github.com/manisandro/gImageReader

It recognizes characters on the screen with Tesseract. It is open-source.

A video about training.

---

https://dynobo.github.io/normcap/

Capture screen and recognize the characters with Tesseract. It is open-source.

---

https://github.com/Akylas/OSS-DocumentScanner

It uses Tesseract 4 data on Android. It is open-source.

Optical Character Recognition

---

https://tegaki.github.io/

Handwriting recognition for Chinese and Japanese. You can download new models and load them. It is open-source.

Language Identifier

---

http://www.polyglot3000.com/

Language identifier.

---

https://github.com/cisnlp/GlotLID

Language identifier in command-line. It is open-source.

Resource Links

---

https://commons.wikimedia.org/wiki/Commons:Free_media_resources

Free media resources.

---

https://www.lexilogos.com/english/index.htm

This one is in a great quantity.

---

https://www.ats-group.net/language-resources.html

This service has many languages.

---

http://lexicity.com/

This one focuses on ancient languages.

---

http://www.meta-share.org/

Repository for language researching.

Digital Archive

---

https://archive.org/

Archive of the Internet since 1996 and other things. Really cool!

---

https://wiki.archiveteam.org/index.php/Main_Page

Introductions to online databases.

Virtual Private Network and others

---

mailto:get@psiphon3.com

Those who are hindered from accessing the world Internet, send an e-mail to it.

Official site: https://psiphon3.com/en/index.html

---

https://www.torproject.org/

For visiting Project Gutenburg and other sites, if some books are still not in public domain in your country. It is open-source.

It won't lead you to the dark web, if you don't know any such address.

---

https://protonvpn.com/

It doesn't allow torrenting on the free plan, but there's no volume limit.

---

https://windscribe.com/

They provide 10GB each month with high speed and multiple locations for free. Great for “immersive language learning”.

-- AUTHOR --

GrimPixel

Other Lessons

• How to Customise Open–Source Language Games
• Historical Realistic Video Games
• Most Popular Sports
• Ordering with Letters
• How to contribute to wiki lessons (FAQ)
• Elements of Traditional Architectures: Western Europe
• How to be Creative
• Keyboards
• Natural phenomena
• Techniques for learning languages