GoldSrc

GoldSrc, the GoldSource engine, is the engine developed by Valve Corporation from 1996-98 to power their first game, Half-Life. GoldSrc was derived from the Quake Engine licensed from id Software, and improved with advanced animation techniques and artificial intelligence.

Games using the GoldSrc engine

 * Half-Life (Valve - 1998)
 * Team Fortress Classic (Valve - 1999)
 * Half-Life: Opposing Force (Gearbox Software - 1999)
 * Half-Life: Blue Shift (Gearbox Software - 1999)
 * Counter-Strike (Valve - 2000)
 * James Bond 007: Nightfire (PC Version) (Gearbox Software - 2002)
 * Day of Defeat (Valve - 2003)

Derivative Engines

 * Source