dhewm3 - dhewm 3 is a Doom 3 GPL source port, known to work on at least Windows, Linux, macOS and FreeBSD.
RBDOOM-3-BFG - RBDOOM-3-BFG is a modernization effort of DOOM-3-BFG.
Doom - Doom is a science fiction horror-themed first-person shooter video game in which players assume the...
GZDoom - ZDoom is a family of enhanced ports of the Doom engine for running on modern operating systems.
Freedoom - Freedoom is a WIP a complete free content game based on the Doom engine.
Anarch - Suckless, anticapitalist, public domain game for everyone