Azuriom is a complete open-source web solution for game servers
Distributed server for social and realtime games and apps
A lightweight game server framework implemented with Actor Model
Arianne is an engine to develop multiplayer online games like Stendhal
LGSL (Live Game for PHP 5.4-8+: online status for various gameservers
A mobile game distributed server implemented using netty4.X
Web based Game server control panel
The best code this side of the galaxy
A FastDL Server for Counter Strike in C#