The repositories listed below contain several thousand open textbooks, covering a variety of disciplines. However, there is some overlap. Because the open licenses permit redistribution, you may find the same resource in multiple repositories.
Provides more than 400 open textbooks in over 20 different subjects. Many titles include faculty peer reviews. See also links provided elsewhere in this guide to subject-specific materials from Open Textbook Library.
The mission of OpenStax, a non-profit based at Rice University, is to improve student access to education. Here you'll find not just open textbooks, but also free integrated instructor resources, learning tools, and courseware. See also links provided elsewhere in this guide to subject-specific materials from OpenStax.
A program of the California State University System, MERLOT II includes over 5,700 open textbooks in multiple disciplines, with faculty peer reviews. In addition to textbooks, MERLOT II includes over 70,000 other types of OER (see link below). See also links provided elsewhere in this guide to subject-specific materials from MERLOT II.
The open textbooks available here, written and peer-reviewed by SUNY faculty, cover a wide range of subjects in business, science and mathematics, social sciences, nursing and health sciences, and the humanities.
The BC Open Textbook Collection was launched in 2012 to provide open textbooks for the 40 highest enrolled post-secondary courses in British Columbia. It now contains over 200 open textbooks for courses in the arts and humanities, business, education, health professions, sciences, and social sciences.
OER Commons is a "digital public libray and collaboration platform" from the Institute for the Study of Knowledge Management in Education (ISKME). The link above will take you directly to a list of post-secondary OER. NOTE: This site includes materials which cannot be revised or remixed. To exclude these, use the "Conditions of Use" limiter on the left side of the screen. Choose either "No Strings Attached" or "Remix and Share" to only view materials which include all OER permissions.
A program of the California State University System, MERLOT II includes over 80,000 OER, comprising instructional content, learning assessments, and course planning tools. The OER available on MERLOT II span across all academic disciplines.
SUNY's OASIS (Openly Available Sources Integrated Search) allows you to search for many different types of open educational content--textbooks, course materials, simulations, videos, and more. You can also browse OER by subject on the OASIS site.