UED
From DoomWiki.org
UED is a tool using heavily modified DEU source code, programmed by Elric "Darkhaven" Sullivan. Currently it supports Hexen Format 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, which is a BSP-tree building utility based on BSP source code, and can read either Doom format maps or Hexen format maps. Both tools is packaged with UWAD.
Status Report:
Progress: 20%
Current Version: 0.02a
Current Stage: Pre-Alpha at source level