J.A.C.K.

J.A.C.K. is a versatile, cross-platform level editor designed for games with a Quake-style BSP architecture, such as Half-Life, Quake, Quake II, and Quake III. Its goal is to provide a convenient, user-friendly tool that combines the best features of existing editors like Valve Hammer Editor and Q3Radiant, addressing their inherent limitations. J.A.C.K. currently supports classic games, with plans to extend compatibility to Source Engine and Unity-based games.