Open textbooks are free, online learning materials with Creative Commons licenses. Many of the collections will have links to the same books, but each will have a particular focus, and items you can't find in other collections.
Search for content published on Pressbooks Networks.
Collection of openly-licensed textbooks that been reviewed by faculty from a variety of colleges and universities to assess their quality. The Open Textbook Library is supported by the University of Minnesota Center for Open Education and the Open Education Network.
OpenStax is a nonprofit educational initiative based at Rice University that publishes high-quality, peer-reviewed, openly licensed college textbooks that are absolutely free online and low cost in print.
Collection of open textbooks for a variety of subjects and specialties from the B.C. Campus OpenEd. The open textbooks have been reviewed by faculty, meet accessibility requirements, and/or include ancillary materials (quizzes, test banks, slides, videos, etc.).
A non-commercial open textbook organization initiated at the University of California, Davis. Their collection is used across the nation as primary course textbooks and as supplemental learning resources.
An open-access textbook publishing initiative established by State University of New York libraries and supported by SUNY Innovative Instruction Technology Grants. They publish high-quality, cost-effective course resources by engaging faculty as authors and peer-reviewers, and libraries as publishing service and infrastructure.
Open textbook recommendations for the most common general education courses at Washington colleges and universities.