The Khan Academy is a not-for-profit with the goal of changing education for the better by providing a free world-class education to anyone anywhere.

Exploratorium, a "museum of science, art and human perception," contains many hands-on activities, digital explorations, online exhibits, and live and archived webcasts.

Soliya is a pioneering non-profit organization using new technologies to facilitate dialogue between students from diverse backgrounds across the globe. 

60 Second Recap takes great works of literature and offers 60 second video clips that are easily understood.

Open Culture provides free cultural and educational media.

Brightstorm Math offers free help with algebra, geometry, trigonometry, precalculus and more with more than 2,000 online videos.