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educational resources - https://eleed.campussource.de/archive/10/4084. Pegged as the "biggest library of totally free, online practice questions worldwide, this Kaplan division teamed up with OpenStax to develop questions sets specifically for its open textbooks. This OER-focused business supplies open courses with "zero textbook expense." Their curriculum features all the OER students will require. The California State University System's collection of slightly more than 45,000 resources is rated, peer-reviewed and tallied by the number of "individual collections" each lives in.
MIT's library of online books is one of the couple of sources for OER on aeronautics, civil engineering and product science, amongst lots of other disciplines.