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Openly Available Sources Integrated Search (OASIS) is a search tool for finding open content, including textbooks, courses, course modules, audiobooks, video and more.
Open Textbook Library
Complete textbooks that have been reviewed by a variety of college and university faculty, and can be downloaded for no cost, or printed at low cost. All textbooks are either used at multiple higher education institutions; or affiliated with an institution, scholarly society, or professional organization. Includes the OpenStax collection.
BC Campus Open Textbooks
A large collection of openly licensed textbooks, some of which have been faculty reviewed.
A large repository that includes all kinds of Open Educational Resources. Use the search limiters to narrow by education level, material type (i.e. Textbooks) and subject
More Open Textbooks
Nonprofit based at Rice University that has published more than 20 open source, peer-reviewed, textbooks in common undergraduate subjects like Algebra, History, and Psychology. Note that OpenStax textbooks can also be found through a search of the Open Textbook Library (linked above).
A project of the Wikimedia Foundation, this collection of group-written textbooks in a variety of sources follows rules similar to Wikipedia.
Online teaching, learning, and faculty development services contributed and used by an international education community. Includes open textbooks. The Material Type and Audience limiters in Advanced Search are particularly helpful.