Open Source & OER

The web's largest catalog of open source textbooks and is a very good place to find free books about math, science, and computers.

The textbooks are created (or, where possible, re-created from existing open educational resources) by BC post-secondary faculty, reviewed by B.C. faculty and made available under a Creative Commons license.

Search over 52,919 academic peer-reviewed books. 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. All DOAB services are free of charge and all data is freely available.

A free and open resource designed primarily for higher education.

Worldwide learning network of shared teaching and learning materials.

OpenStax publishes high-quality, peer-reviewed, openly licensed textbooks that are absolutely free online and low cost in print.

These books have been reviewed by faculty from a variety of colleges and universities to assess their quality. These books can be downloaded for no cost, or printed at low cost. All textbooks are either used at multiple higher education institutions; or affiliated with an institution, scholarly society, or professional organization.

Open SUNY Textbooks is an open access textbook publishing initiative established by State University of New York libraries and supported by SUNY Innovative Instruction Technology Grants. This pilot initiative published high-quality, cost-effective course resources by engaging faculty as authors and peer-reviewers, and libraries as publishing service and infrastructure.

Format similar to Wikipedia but some authors and editors use their real names. There are obvious problems with using textbooks anyone may edit but since they are not copyright the material could be hijacked into a stable by any instructor and used in a more stable format.

Free lecture notes, exams, and videos from MIT.

A collection of high quality, free-to-use courses that you can download and use for teaching. All content is stored in Google docs making it easy to access, browse and download.

Open Yale Courses provides free and open access to a selection of introductory courses taught by distinguished teachers and scholars at Yale University. The aim of the project is to expand access to educational materials for all who wish to learn.

Saylor Academy's main project is providing free, self-paced certificate and credit courses to students around the world.
But our courses are also open courseware (OCW) comprising open educational resources (OER). As such, most materials you find at Saylor Academy can be reused in some fashion.