J.A.C.K. (previously known as Jackhammer) is a brand new level editor for games with a quake-style BSP architecture (Half-Life, Quake, Hexen II, Quake II, Quake III, Gunman Chronicles). The aim is to develop a convenient cross-platform tool capable of incorporating the best features of existing editors, such as Valve Hammer Editor, Q3Radiant and others. The list of supported games will be extended. Today it has finally become available in Steam Store!