These are some of the more popular OER sites.
College Open Textbooks
This site lists open textbooks organized by subject area, many of which have been peer reviewed for their suitability at community colleges.
- GALILEO Open Learning Materials
GALILEO Open Learning Materials brings together open educational resources throughout the University System of Georgia, including open textbooks and ancillary materials.
- Lumen Learning
- This OER-focused company provides open courses with "zero textbook cost." Their curriculum comes with all the OER students will require.
- MERLOT II
MERLOT is a curated collection of free and open online teaching, learning, and faculty development services contributed and used by an international education community. Use the Advanced Search to limit by subject, educational level, type of resource, and more. The Content-Builder facilitates creation of new OERs.
MIT Open Courseware Online Textbooks
MIT's library of online textbooks is one of the few sources for OER on aeronautics, civil engineering and material science, among many other disciplines.
OER Commons is a freely accessible online library that allows teachers and others to search and discover open educational resources (OER) and other freely available instructional materials.
Open Education Consortium
The Open Education Consortium is a community of 240-plus schools as well as organizations and people who want to advance the idea of "open education." It features an OER resource toolkit, webinars, in-person events and links to open textbooks.
Open Learning Initiative
Carnegie Mellon's (PA) open courses (and associated content) denote a marked emphasis on STEM, including computing.
- Open Textbook Library
Peer-reviewed higher education textbook list compiled by Open Textbook Network
- OpenStax CNX
This is Rice University's (TX) "open space," where educators have stashed thousands of learning objects that can be or are already organized into books. It is also the parent of OpenStax College.
Open Stax College has open, peer-reviewed, free e-texts with support materials for instructors. Offers an option to purchase print copies at cost.
OpenStax CNX allows searching and sharing of OER learning modules. (See https://cnx.org/browse)
Many academic libraries have created Research Guides (sometimes called LibGuides) with OERs selected for their specific population.