Open Educational Resources (OER) & Open Textbooks

An extensive referatory for openly licensed educational materials of all types, at both K-12 and post-secondary levels.

An index to materials developed by the Ohio Open Ed Collaborative.

A long-running initiative to create and collect peer-reviewed online learning materials.

This search engine from George Mason University is connected to several major OER repositories.

Provides video lectures, lecture notes, and supplemental materials based on courses offered at MIT.