New kid on the block: Babylon.js
There is a new JavaScript framework called ‘Babylon.js’ by David Catuhe which is the first one for some time that does not rely on Three.JS.
I didn’t have time to play with it yet, but it looks awesome.
Check out the demos on the website!
It is open source under a Microsoft license and the first major contribution from MS to the WebGL community that I know of. Kudos to David and Microsoft!