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OER Commons includes many types of educational resources from complete university courses to open textbooks, interactive, web-based activities and lesson plans. Ability to search by subject and education level.
Open Textbook Library provides access to open textbooks that have been funded, published, and licensed to be freely used, adapted, and distributed. The books in the Open Textbook Library have been reviewed by faculty from a variety of colleges and universities to assess their quality.
OpenStax provides peer-reviewed, openly licensed materials and some titles provide instructors ancillary materials such as quizzes, homework, powerpoint presentations, etc.