An online library of peer-reviewed, full-text open textbooks for higher education covering most subjects. Many of the textbooks have been reviewed by faculty in the Open Textbook Network.

Open textbooks published by the State University of New York system. Subjects: Business, General Education, Humanities, Science, Social Science.

Free an open textbooks curated by the University of South Florida. Subjects: Children's Literature, Journalism, Math.

A nonprofit based at Rice University that has published over 25 open textbooks, covering most introductory undergraduate courses.

The WikiBooks collection is managed by the Wikimedia Foundation and contains thousands of open textbooks ranging all subjects.

developed by SUNY Geneseo, is a search platform that aims to make discovery of open content easier. OASIS currently searches open content from 76 different sources and contains more than 177,000 records.

From the Engineering Library Division, a comprehensive list of open textbooks within engineering, organized by discipline.

developed by SUNY Geneseo, is a search platform that aims to make discovery of open content easier. OASIS currently searches open content from 76 different sources and contains more than 177,000 records.

A digital library of open educational resources, including textbooks, syllabi, lesson plans, activities, and courses. You can browse by education level to narrow your search to college-appropriate materials. A project supported by the Institute for the Study of Knowledge Management in Education.

A digital library of open educational resources for all education levels and subjects. You can narrow searched by material type, audience, and format. The library is supported by California State University.

Over 50,000 e-books available for download. Mostly covering public domain literary works. You can search or browse by subject.

Materials for over 2,000 courses available from the Massachusetts Institute of Technology.

An open source online learning platform with quizzes and homework assignments for college-level mathematics.