Doom2
Skulltag v.97d
Skulltag is a port for the original Doom and Doom II.
Doom Builder v.2.1.0.1356
Doom Builder is an advanced, revolutionary map editor for Doom and games based on the Doom engine, such as Heretic, Hexen and Strife. This editor is highly extendible for the different game engines of the Doom community.
Doomsday Engine v.1.9-.9
The Doomsday Engine is an enhanced Doom port. The project has been alive since 1999 and nearly 10 years after there are still updates coming.
Quake2xp v.7.0
Quake 2 is a based engine with glsl per pixel lighting effects and more.