Education

Anki is an open-source flashcard program using spaced repetition, a technique from cognitive science for memorization.

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.

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.

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.

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

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.

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

Nelson is a scientific software package providing a powerful open computing environment for engineering and scientific applications using modern C/C++ libraries (Boost, Eigen, etc.) and other state-of-the-art numerical libraries.

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.

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

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

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.