Unreal Engine - 1998

Unreal Engine is a game engine developed by Epic Games, first used in 1998's Unreal.
Unreal Engine
Unreal - 1998
Wheel of Time - 1999
Unreal Tournament 99 - 1999
Nerf Arena - 1999
Rune - 2000
Deus Ex - 2000
Clive Barker's Undying - 2001
Mobile Forces - 2002
Global Operations - 2002
Duke Nukem Forever - 2011
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Unreal Engine 2 (2004)