Speed Demos Archive
speeddemosarchive.com (usually refered to as SDA) is an offshoot of the Quake done Quick community's longtime demo site. Nolan "Radix" Pflug opened the Archive to non Quake-related speedruns in March of 2004, and SDA has been the world's top multi-system speedrun competition site ever since.
SDA currently contains speedruns for 432 games.