Freely available educational materials, geared mostly to the community college level. Some sites are not technically open educational resources but are high-quality, free ones.
Textbooks, articles, supplements, learning resources for free online and free download. Can be copied and modified and reposted under your own name with attribution.
"An interdisciplinary research group that (1) conducts original, rigorous empirical research on the impact of OER adoption on a range of educational outcomes and (2) designs and shares methodological and conceptual frameworks for studying the impact of OER adoption."
A supporter of open educational resources "to improve the quality of education as well as facilitate policy dialogue, knowledge sharing and capacity building."