This game engine is being used to develop a game, but will periodically be updated here. Eventually, once the code becomes stable, it will be packaged up neatly here and have a build process created around it.
Trust me though, it's pretty good already.
If you want to know more, head on over to the wiki.
Notes on building
To build, you need to install node.js. You need at least v0.10
To set up:
npm install -g grunt-cli npm install
grunt production test
Or to test unminified:
grunt dev test