Mathematics
Coming soon
Algebra, calculus, statistics, and more — structured for self-study and classrooms.
Open textbooks. Free to read. Open to improve.
High-quality learning materials for elementary school through university — on the web, at no cost.
- Free means the whole book, for everyone — read it all online without paywalls.
- Open means open source — anyone can fix a typo, add a chapter, or fork a book on GitHub.
Catalog
Browse by subject
Science
Coming soon
Physics, chemistry, biology, and earth science from introductory to advanced levels.
Humanities
Coming soon
History, literature, philosophy, and languages — readable, citable, and free to share.
Computing
Coming soon
Programming, computer science fundamentals, and practical skills for students and teachers.
Subject pages and full catalogs are on the roadmap. Contribute a book on GitHub.
Featured
Featured books
Your textbook here
Placeholder
We are building the first open catalog. The first published books will appear in this grid.
Community contributions
Open source
Every book is a repository you can fork, translate, or adapt for your classroom.
Want to list a book? Open a pull request or start a discussion on GitHub.