Natchat is a project mainly written in JAVASCRIPT and PYTHON, based on the MIT license.
A Node.js + socket.io based chat that creates private chat rooms based on the external IP address of the users.
NAT Chat is based on Node.js and socket.io to allow secure password-less instant chat. Check out the demo at https://natchat.com/.
The best way to run it is to set up a different web server to serve static media and only use server.js to take care of chat communications. nginx powers https://natchat.com/.