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UltimateDoomBuilder/UltimateDoomBuilder
Comprehensive map editor for Doom, Heretic, Hexen and Strife based games. Works best for ZDoom-family ports while also supporting classic engines. Based on GZDoomBuilder by MaxED & Doom Builder 2 by CodeImp (see — http://doombuilder.com)
ZDoom/gzdoom
GZDoom is a feature centric port for all Doom engine games, based on ZDoom, adding an OpenGL renderer and powerful scripting capabilities