QuakeSpasm LicenceGNU General Public License, version 2.0Kindgame engine, source portBased onFitzQuake
Vanilla Conquer Kindsource portBased onCommand & Conquer: Red Alert, Command & Conquer, Command & Conquer Remastered Collection
VCMI LicenceGNU General Public License, version 2.0Appeared2007Kindgame engine, free software, source port, video game
ZDoom LicenceGNU General Public License, version 2.0Kindfree software, source portBased onATB Doom, Linux Doom