This page contains sites that offer Open Educational Resources or Affordable Educational Resources
This site has peer-reviewed more than 100 OER textbooks and provides links to many more. Also contains links to free textbooks by subject.
California State University System manages a catalog of thousands of resources in science and technology, math and statistics, humanities, and education. Resources other than textbooks are offered here.
MIT provides an online textbook page along with links to the textbook files used in their online courses. This site is useful for course materials not covered by other sources.
The nonprofit Institute for the Study of Knowledge Management in Education launched this site to share content from around the world. College level textbooks represent around 600 results and many are listed in other collections in this list.
This site lists a meta collection of free textbooks many taken from other sites listed here. Other collections of free online courses, movies, audio books and other forms of education content are listed.
A pilot project of the State Universities of New York libraries. The titles listed are authored by faculty and published by the libraries.
The American Institute of Mathematics Editorial Board maintains a list of approved OER textbooks suitable for use in university courses. The list is searchable by subject. They also provide guidance to potential authors.
The University of Minnesota supports this site which represents a consortium of higher education institutions who networked to use OER in their programs. The library of textbooks pulls titles from many sources including some in this list.
Rice University launched this site with 13 titles. There are now 46 in subject areas ranging from anatomy to sociology. The parent organization OpenStax CNX provides an open library of learning objects that can be utilized in custom curricula.
Known for its free courses, the organization also make the curriculum from each course available in downloadable textbook form.
Wikimedia Foundation hosts this site which offers 2,900 textbooks categorized by subject, completion status and reading level. Many of the books can be downloaded as PDF files.