In this category are tools to study and learn a language, dictionaries and translation services, mathematics tools (such as calculators and equation editors), astronomy (sky maps, for example), and any other matter you are interested in. Moreover, this section also contains references where you can find answers to your questions, including encyclopedic and tutorial websites.
Free content, multilingual online encyclopedia written and maintained by a community of volunteers through a model of open collaboration, using a wiki-based editing system.
Encyclopædia Britannica
Anki is a program that makes remembering things easy. Because it is a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying or greatly increase the amount you learn.
Translate instantly across 100+ languages with real-time input, voice on mobile, and offline options. Free with Google integration.
DeepL Translatorand
Khan Academy is not-for-profit with the goal of changing education for the better by providing a free world-class education to anyone anywhere.
Zim brings the concept of a wiki to your desktop. Store information, link pages and edit with WYSISYG markup or directly typing some lightweight markup syntax and see it previewed as-you-type. Creating a new page is easy by either clicking on the "Create new note"...
Wolfram Alpha is a "Computational Knowledge Engine" - different from a search engine, it answers factual queries directly by computing the answer from structured data, rather than providing a list of documents or web pages that might contain the answer.
Free, open-source scientific writing workspace for LaTeX, Typst, and Markdown with desktop performance, local AI-assisted editing, Git versioning, and offline use.
LyXand
Chrome extension translates audio and video in real time to over 70 languages with natural AI voices, live subtitles, and compatibility with streaming or calls.
Google Translate
Linglass turns YouTube and Netflix into a language lesson: dual subtitles, click-to-translate, pronunciation, AI grammar, and spaced-repetition flashcards — as a browser extension, website, and iOS app.
Lightweight offline translation app for Android storing all data locally for increased privacy, featuring fast text-to-speech and efficient copy/paste workflows.
Google Translate
Lightweight iOS flashcard app using spaced repetition, active recall, and offline privacy for flexible study, image support, swipe-based grading, and import features.
