OER Commons is a freely accessible online library that allows educators and others to search and discover open educational resources (OER) and other freely available instructional materials.
Created by the Institute for the Study of Knowledge Management in Education), OER Commons was developed to assist curriculum experts and educators with discovering OER and collaborating around the use, evaluation, and improvement of these materials. Resources on the site can be searched and filtered using an expanded set of descriptive data, including conditions of use. Teachers, students, and others enrich this "metadata" when they tag, rate, and review materials, and share what works for them (Source).
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