OpenStax has a growing collection of peer-reviewed, openly licensed university textbooks in a variety of disciplines, from the sciences to the social sciences to the humanities. Faculty wishing to adopt a textbook must register for a free account.
The Open Textbook Library has a collection of over 100 peer-reviewed and openly licensed titles in a wide range of disciplines. It is supported by the Open Textbook Network, a collaboration of library partners from colleges and universities across the country.
Funded by British Columbia's Ministry of Advanced Education, BCcampus OpenEd has a collection of 180 peer-reviewed open textbooks covering Sciences, Trades, Business & Management, Liberal Arts & Humanities, Social Sciences, Upgrading Programs, Health Related, and Recreation, Tourism, Hospitality & Service.
Milne Library Publishing at SUNY Geneseo manages and maintains the Open SUNY Textbooks, a catalog of open textbooks authored and peer-reviewed by SUNY faculty and staff.