Program: Doom Builder
License: GPL / GNU
Description: "Doom Builder is an advanced Doom, Heretic and Hexen level editor. With this Doom map editor you can edit your maps in 2D mode and 3D mode! With the real-time editing in the 3D mode you can modify and see exactly how your map will look in the game."
Website: http://www.doombuilder.com
Download Source Here: http://www.doombuilder.com/files/builder_source.zip
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Don't custom maps require the originals to work?
Vintage!
I used this program before alot. You can create a Map from scratch and add designs to it manually