Blackstone is Minecraft Survival server written in Node.js as an exercise. It's architecture is far from optimal.
Right now the server can be pinged from server selection screen, and user can authenticate (but chunks cannot be sent yet, so no actual game).
Just for fun. I want to try and create functioning server that will serve as playground for Mob AI testing. That's all.
First, thanks for this awesome game, Notch! Thanks to authors of Minecraftwiki.net and Minecraft Coalition wiki for protocol information.