BCampus OpenEd: Open access textbooks, not all may be reviewed
Milne Open Textbooks : Milne Open Textbooks began as the project Open SUNY Textbooks: an open access textbook publishing initiative established by State University of New York libraries
OpenStax: Peer reviewed college level textbooks
(Free) OpenStax LMS Course Packages : choose a book, then click on the "Instructor Resources" tab.
Open Textbook Library: Hundreds of open access college level textbooks
Directory of Open Access Books: Open access academic books, includes international publications
JSTOR Open Access E-Books: Open access eBooks from select university presses
Pressbooks: This directory provides an index of 2091 books published across 93 Pressbooks networks.
Project Gutenberg: Open access books that are in the public domain