UED is a tool based on heavily modified DEU source code, programmed by Elric "Darkhaven" Sullivan. The source to the tool is currently at an alpha level (the latest version is version 0.2a). It supports Hexen maps and ZDoom in Hexen format maps and is home to a self-contained script editor. Also it is the only editor to use UBSP, a BSP-tree building utility based on BSP source code, which can read and compile either Doom format maps or Hexen format maps. Both tools are packaged with UWAD.