I built this little Web game with Node.js, Three.js, Socket.io and various other libs. I wrote an overview of the tech used here: http://sparklinlabs.com/2013/04/craftstudio-beta-release-dat...

If you have any particular questions about how anything was built, I'd be happy to detail it.

EDIT: By request, I just made the repository public. It's not open source but feel free to check it out if you want to see how it was made - https://bitbucket.org/sparklinlabs/sparklinwars/