GraphOX is awesome
Open Source Virtual World and MMOG Development Platform
Proxy for games that emulates network conditions like ping and lag.
Tools for installing and setting up dedicated Battlefield servers
minecraft, server, statistik, bukkit, gigacraft
PHP Multiplayer Chess Script
Multiplayer snakes and ladders game Script
A Plugin for the Bukkit Server Wrapper system that messes with people!
Frontend for Minecraft Server
Multi-user whiteboard emphasizing simplicity.
Networked training tool for Air Traffic Controllers