"Stargate Network" is a free private game made with the Unreal Development Kit. It's a multi-player RPG-Simulator game based on the Stargate series (Stargate SG_1, Stargate Atlantis, Stargate Universe). In SGC, a lot of programs faithfully reproduced from the famous Dialing Program to others programs least knowns will able you to control the Stargate and the base. Join a team, and go to explore the galaxy !
Relax! I've only spoken about a demo and the included features are minimal: only the control room is playable, and the only feature is to dial the gate.