Open Textbook Library
The Open TextBook Library is supported by the Center for Open Education and the Open Textbook Network based at the University of Minnesota. It provides lists of open textbooks, with reviews from staff at Universities in the US and UK, available to download in a range of formats. All books included are either used at multiple higher education institutions; or affiliated with an institution or scholarly/professional organisation.
The OAPEN (Open Access Publishing in European Networks) Library contains freely accessible academic books, mainly in the area of humanities and social sciences. OAPEN works with publishers to build a quality controlled collection of open access books.
This site contains more than 2,400 books across engineering, physical, life and health sciences, and social sciences published under the Creative Commons licenses. Over 3,200 titles are available.
OpenStax is based at Rice University in the US and contains peer-reviewed open textbooks in the areas of Maths, Science, Social Sciences and Humanities.
Based at the University of British Columbia this collection includes around 180 open textbooks created, reviewed, and shared in a range of subject areas.
College Open Textbooks
A collection of 29 organizations came together to create College Open Textbooks (COT). COT is not a repository of open textbooks - their listings point to textbooks on many repositories.
Open SUNY Textbooks
Open SUNY Textbooks is run by libraries in the State University of New York system. Their mission is to provide an infrastructure to supp ort the adoption, remixing and creation of open educational resources.
Over 600 open access (OA) books from several distinguished university presses and scholarly societies.