“TED-Ed’s commitment to creating lessons worth sharing is an extension of TED’s mission of spreading great ideas. Within the growing TED-Ed video library, you will find carefully curated educational videos, many of which represent collaborations between talented educators and animators nominated through the TED-Ed platform. This platform also allows users to take any useful educational video, not just TED’s, and easily create a customized lesson around the video. Users can distribute the lessons, publicly or privately, and track their impact on the world, a class, or an individual student.”
Academic Earth –http://www.academicearth.org/
“Academic Earth is an organization founded with the goal of giving everyone on earth access to a world-class education.”
P2P University – http://p2pu.org/en/
“It’s online and totally free. At P2PU, people work together to learn a particular topic by completing tasks, assessing individual and group work, and providing constructive feedback.”
Open Yale Courses- http://oyc.yale.edu/
“provides free and open access to a selection of introductory courses taught by distinguished teachers and scholars at Yale University. The aim of the project is to expand access to educational materials for all who wish to learn. All lectures were recorded in the Yale College classroom and are available in video, audio, and text transcript formats”
Note: the sites are arranged in no particular order.