Stage3D developer tips #5:
Gordon is a lightweight server for developing multiuser apps and games with Adobe Flash/Air. It uses a lean binary protocol to exchange data.
With ‘Gordon’ you can build realtime or turn-based multiplayer apps and games.
The server is based on NodeJS and it’s pretty easy to add server side logic. Currently there are client APIs for Flash/Air and HTML5. The project runs under the MIT license and thus it’s completely free to use or modify.