I started this little project as an experiment for learning WebGL. I'm currently using three.js, but that may change if I decide to check out other frameworks.
Currently you can't actually turn the individual faces of the cube, which makes it pretty boring. I hope to add that soon.
The environment map (the background) is the work of Emil Persson, aka Humus, and is licensed under a Creative Commons Attribution 3.0 Unported License.