MIT OpenCourseware is an online repository with course materials for over 2340 courses developed for MIT’s online learning outlets. MIT OCW is widely used by educators and students both for developing/assembling course content and finding additional course materials to supplement learning. Courses are listed by topic, instructional approach, and materials. The OCW Educator helps users search the vast library of OCW resources to explore and find new instructional approaches and teaching materials.
[Disclaimer: some courses list books to buy on Amazon so it’s not all free. However, exploring the extensive list of courses can lead to unexpected reading pairings and other, free resources.]
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Some materials on MIT OpenCourseware are openly licensed but not OER, and some are zero cost. Also, please make note of the disclaimer above.