Rellat
The Simultaneous Collaboration Coding service to show people how to make code in real time. Rellat Alpha with WebRTC. Simple Collaborative Code editor. Code name is Otter. This is web client. You can test it on http://ide.rellat.com/
If you want to run your own service, check the serverside code(rellat-server).
Client side code is based on multihack-web