Education

Project Gutenberg is a volunteer effort to digitize and archive cultural works and encourage the creation and distribution of eBooks. The library includes over 60,000 free eBooks.

Open edX is an online open-source learning platform that enables educational institutions to offer courses and programs for remote learning. It was created by the joint efforts of Harvard University and MIT for the well-known learning platform edX.

Clozemaster is a language learning website and app that helps you learn vocab within the context of a sentence. It shows you a sentence with one word missing. You learn new words by choosing the correct word from multi-choice options.

Sigil is an open-source multi-platform EPUB eBook Editor. Sigil supports code-based editing of EPUB files and the import of HTML and plain text files. A companion application, PageEdit, allows WYSIWYG editing of EPUB files.

The site famously features K-12 video tutorials created by Sal Khan and the team.

QST (quiz, survey, and test) is an online examination and survey software with numerous features like an equation and basic editors, a question bank, multiple delivery options, export/import/convert questions, branching questions/skip logic, and many more.

sqlbook.io is a web service to learn and practice SQL on your own Oracle, MySQL, PostgreSQL, and MariaDB instances.

Adapt is an e-learning authoring tool that creates fully responsive, multi-device, HTML5 e-learning content.

Math is Apache OpenOffice's component for mathematical equations. It is most commonly used as an equation editor for text documents, but it can also be used with other types of documents or stand-alone.

LibreLingo is an open-source web app for learning language using interactive exercises. Currently, this new project only supports Spanish learning for English speakers.

Sheppard Software is a website for online learning games and activities for kids that host hundreds of games in different categories like science, math, animals, languages, and more.

BigBlueButton is an open-source virtual classroom application for online education that provides real-time audio, video, slides, whiteboard, chat, and screen sharing. It also allows participants to join the conferences with webcams and invite guest speakers.