I found Famo.us and it seemed pretty exciting but their docs are closed. I am very curios about WebGL so I started looking for alternatives. I found Three.js and Clara.io.
http://Clara.io is an online 3D modeling, rendering and publishing platform that can import and export in standard formats. It uses ThreeJS/WebGL and it imports and exports in the ThreeJS format as well.
Although Clara.io is not intended for creating applicatipns, you can also easily make interactive experiences Clara.io such as this demo by Klaas:
https://exocortex.github.io/klaas