A collection of peer-reviewed, openly licensed textbooks across disciplines.
From the University of Minnesota, a collection of textbooks that have been funded, published, and licensed to be freely used, adapted, and distributed. These books have been reviewed by faculty from a variety of colleges and universities to assess their quality and can be downloaded for no cost, or printed at low cost.
An online search engine from SUNY Geneseo and includes the ability to limit search results by subject, license, source, and more.
A public, digital library of open educational resources, including hundreds of open textbooks for use in higher education.
A collection of free and open online teaching and learning resources.
The Center for Open Educational Resources and Language Learning, from the University of Texas at Austin, is a collection of language learning materials in a variety of formats.