Quake Army Knife 6.6 beta

A powerful editor for games based on or similar to id Software's series of Quake games. Currently supports 31 distinct games, and a countless number of mods. Integrates a map editor, model editor, archive editors and texture management.
It's an editor for many games: Quake 1, Hexen 2, Quake 2, Heretic 2, Half-Life, Sin, Kingpin, Soldier of Fortune, Quake 3: Arena, Star Trek Voyager: Elite Force, Half-Life 2 and a lot more.