Free & open-source tools

Free world-class lessons K-12 through early college.

Full MIT course materials — lectures, notes, exams.

Interactive coding curriculum + certifications.

Full-stack web dev curriculum, 100% open source.

Harvard's legendary intro to computer science.

Free, peer-reviewed, openly-licensed textbooks.

World's most-used open-source learning management system.

The platform behind edX — host MOOCs at scale.

Modern open-source LMS by Instructure.

Create interactive HTML5 content — quizzes, videos, slides.

Powerful spaced-repetition flashcards used by med students worldwide.

Open-source SRS flashcard system, research-backed.

Reference manager & research collaboration tool.

Local-first outliner / PKM for connected notes.

Markdown knowledge base with backlinks & graph view.

Interactive geometry, algebra, statistics & calculus.

Beautiful graphing calculator used in classrooms globally.

Computational knowledge engine for STEM.

Notebooks for interactive computing, used in research & teaching.

Open-source mathematics software system.

Free interactive math & science simulations.

Gamified language learning, 40+ languages.

Free thinking-method audio courses.

Open-source alternative to Duolingo.

Collection of example sentences in 400+ languages.

Open-source virtual classroom with whiteboard & breakouts.

Self-hostable video conferencing.

Real-time collaborative document editor.

Virtual whiteboard for sketches, diagrams & teaching.