ReMooD is a source port of Doom Legacy, which is itself a source port based on Doom Legacy. It aims to provide the classic Legacy experience with new features and more stability. This supports most versions of Windows, ReactOS 0.3.x and higher, and Linux (x86 and x86_64).
EDuke32 is a Duke Nukem 3D port that adds several hundred new features for players and developers of user content, including hardware accelerated renderers that take advantage of modern graphical hardware.
ChaosEsque Anthology is a first person shooter. It is a standalone modification of Xonotic which includes extended weapons, maps, vehicles, buildable buildings, mounted weapons, spell casting, monsters, player characters, textures, and game modes.