Open source textbooks that are written by professional content developers who are experts in their fields and undergo a rigorous peer review process. All textbooks meet standard scope and sequence requirements.

The Open Textbook Library provides a growing catalog of free, peer-reviewed, and openly-licensed textbooks. The Open Textbook Library is supported by the Center for Open Education and the Open Textbook Network.

MERLOT is a curated collection of free and open online teaching, learning, and faculty development services contributed and used by an international education community. The MERLOT Collection is made up of over 40,000 materials in 19 different material type categories.

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 publishes high-quality, cost-effective course resources by engaging faculty as authors and peer-reviewers, and libraries as publishing service and infrastructure.

BCcampus was asked to create a collection of open textbooks aligned with the top 40 highest-enrolled subject areas in the province. A second phase was announced in the spring of 2014 to add 20 textbooks targeting trades and skills training. Our open textbooks are openly licensed using a Creative Commons license, and are offered in various e-book formats free of charge, or print on demand books available at cost.

OER Commons helps educators, students, and lifelong learners avoid time-consuming searches and find exactly the right materials. With a single point of access from which they can search, browse, and evaluate resources in OER Commons’ growing collection of over 50,000 high-quality OER everyone can more efficiently find what they need.

Open textbooks, syllabi, and supporting materials created under Affordable Learning Georgia OER grants. Materials are licensed under various Creative Commons licenses.

Massachusetts Institute of Technology is one of the forerunners in open courseware, making "virtually all MIT course content" available online for public access.

Carnegie Mellon offers courseware online, in addition to complete courses as well. Its mission is to improve higher education by offering such resources online.

The Open Education Consortium in collaboration with MERLOT offers a search engine on OER (Open Educational Resources). OER are openly licensed online educational materials that allow teachers and students to freely use, share, and modify.

The Open Course Library (OCL) is a collection of shareable course materials, including syllabi, course activities, readings, and assessments designed by teams of college faculty, instructional designers, librarians, and other experts.

Saylor Academy is a nonprofit organization that offers nearly 100 full-length, free and open courses at the college and professional levels.