OER Commons
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OER Commons hosts a vast collection of educational materials released under open licenses. You'll find complete courses, lecture notes, textbooks, and videos all freely available for download and reuse. Educators worldwide contribute their work, keeping the library diverse and current.
It's ideal for teachers looking to build custom curricula without licensing restrictions and for students seeking supplementary materials at no cost. The open-license model means you can legally adapt and remix content for your needs.