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Cross-Platform OpenGL Doom Source Port with powerful modding features
Eureka is a cross-platform map editor for the DOOM engine games.
Main Repo for "Aetherius" (for Doom1/2 w/ GZDoom)
Quake Essentials. Better than what a licencee of id would get in 1996. For even more goodness to base your game off of, see https://github.com/VeraVisions/nuclide
"Explosive Expedition" Character/RPG modification based on the character Dinah Wyck from Dynamite Duchess/Appetite For Detention/Carnival of Souls, for GZDoom. No mod-specific ACS unlike Aetherius, only ZScript :V
DOOM 1 & 2 .wad tools for creating and extracting wad files (WIP)
Biff Fraggar is a Freedoom-inspired id Tech 1 game under the GPL license.