站点：https://open.umich.edu/education

官方介绍：

OPEN EDUCATIONAL RESOURCES
Welcome to the Open Educational Resources (OER) site of Open.Michigan. Here you'll find University of Michigan educational resources such as course materials, videos, software tools, and student work, that all have open copyright licenses. That means these resources are freely available for use, remixing and redistribution. We encourage you to explore, build new educational resources and redistribute the results under similar Creative Commons copyright licenses。