Search among 5,600 FREE and OPEN access textbooks and over 80,000 open course materials. Can also create a course and add to Merlot collection.
Find many recommended FREE and OPEN textbooks and CA higher ed faculty reviews from the UC, CSU, and CCC.
Focuses mostly on mathematics and science.
Open Textbook Library: https://open.umn.edu/opentextbooks/
These books have been reviewed by faculty from a variety of colleges and universities to assess their quality. Download for no cost, or print at low cost. All textbooks are either used at higher education institutions or affiliated with an institution, scholarly society, or professional organization.
Open SUNY Textbooks: http://textbooks.opensuny.org
Many disciplines, including Business, Education, English and Communication, General Studies, Humanities, Mathematics, Natural Sciences, and Social Sciences.
OER by Discipline Guide: https://ecampusontario.pressbooks.pub/mcmasteroerdiscipline/
Lists a broad range of open educational resources organized by disciplines at McMaster University.