DOAB is a community-driven discovery service that indexes and provides access to scholarly, peer-reviewed open access books and helps users to find trusted open access book publishers.
The Internet Archive, a 501(c)(3) non-profit, is building a digital library of Internet sites and other cultural artifacts in digital form.
Includes 30 million digital books, some require a free user account to access.
HathiTrust is a partnership of academic and research institutions, offering a collection of millions of titles digitized from libraries around the world. Not all titles are freely available.
OHP is an international open access publishing collective whose mission is to make leading works of contemporary critical thought freely available worldwide. All publications are peer-reviewed.
punctum books is an open-access publisher dedicated to radically creative modes of intellectual inquiry and writing across a whimsical para-humanities assemblage.
Lever Press is a scholarly press supported by more than 50 liberal arts institutions. They publish peer-reviewed, born digital, open access monographs at no cost to our authors or their academic institutions.
The University of Alberta Press makes significant titles Open Access rather than letting them go out of print, keeping them available to researchers and the general public. Look for a "Download OA File" link below a book's title.