DeePsea 12.12

In a nutshell, DeePsea (formerly DeeP97) is a native 32-bit Windows9x/NT/2000/XP program and DeeP is a 32-bit DOS DPMI program for editing DOOM, DOOM II, Ultimate DOOM, BOOM, ZDOOM (and other DOOM ports), Heretic, Hexen, or Strife levels with Power, Speed and Ease.
The powerful interactive WYSIWYG drawing tools, cut, paste and undo are just some of the features everyone dreams about. It supports keyboard and mouse commands and even lets you draw on wall textures
Interactive Prefab tools: Stair, Door, Rectangle, and Polygon. Create instant Stairs, Teleports, Windows, Doors, Pedestals, and Lights