WatchKnow is a wonderful resource of videos They ask you to ”imagine hundreds of thousands of great short videos, and other media, explaining every topic taught to school kids. Imagine them rated and sorted into a giant Directory, making them simple to find. WatchKnow—as in, “You watch, you know”—is a non-profit online community devoted to this goal.”
I really think they are achieving it.
WatchKnow has indexed over 15,000 online educational videos for children, putting them into a directory of over 3,000 categories. The videos are available without any registration or fees to teachers in the classroom and to students at home 24/7.