Engine rebuild
GZDoom
by Christoph Oelckers (Graf Zahl) and contributors · 2005 · Shooter
Feature-rich OpenGL Doom engine that hosts countless mods.
GZDoom is a feature centric port for all Doom engine games, based on ZDoom, adding an OpenGL renderer and powerful scripting capabilities - ZDoom/gzdoom
Built upon Doom (1993).
Built upon Heretic and Hexen (1994).