Holychat is a project mainly written in JAVASCRIPT and GROOVY, it's free.
A simple Node.JS chat application using NowJS (Socket.IO)
A very simples chat application written in Node.js, using express (with Jade template engine) and Socket.IO. On the client side, I used 52framework for the layout, Jquery and Jquery UI.
We are currently using this application to benchmark WebSocket vs Commet:
Run the server: node holychat.js [transport]
Run the bencharm script: 'node benchmark.js 20 100 100 1000 0 0 websocket'
This is at a very early stage, so nothing is garanteed to work.