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OpenStax - A nonprofit initiative with peer-reviewed OER textbooks
OER Commons - OER lesson plans, resources, and courses
LibreTexts - Online platform to construct, customize, and disseminate OERs
Open Textbook Library - Free, peer-reviewed, and openly-licensed textbooks
California Open Online Library for Education - Free and open textbooks and course materials
Directory of Open Access Books
National Academies Press (NAP)
University Press of Kentucky (UPK) Books
UC Press E-Books Collection, 1982-2004
College of the Canyons Open Educational Resources
Grand Valley State University Open Textbooks
Portland State University Open Access Textbooks
University System of Georgia Open Textbooks
OASIS currently searches open content from 79 different sources and contains 324,517 records! OASIS is being developed at SUNY Geneseo's Milne Library.