GameSpy, a division of IGN Entertainment, is a web-based multi-player game server located in Costa Mesa, CA. It was the company providing the multiplayer for Terminator 3: War of the Machines.
GameSpy was created in 1996 in order to provide multi-player services for the id Software game Quake (when it was then known as QSpy). It has since grown to one of the largest online gaming servers in existence. The website boasts that it "attracts one of the largest concentrated audiences of young males on the internet."