Risen3D is an advanced Doom port by Graham Jackson based on Jaakko Keranen's Doomsday port.

Risen3D Features:

Advanced algorithms provide more accurate rendering in OpenGL.
Full Boom and MBF compatibility.
Super fast rendering of OpenGL graphics.
Slopes and 3D floors.
Md2 models, particle effects and high resolution texture options.
Skybox support.
Translucent water and underwater effects.
Outside fog support for maps that require it.
Model activation capability using the R3D scripting method.
Mobj spawning using the R3D scripting method
Detailed texture support.
Dedicated smart Launcher for easy launching and pwad management.
Uncapped frame rate for smoother game play.
Definition and dehacked editing capabilities.
Basic Doom mode option
Water splashes, ambient sounds, scrolling skies and stealth monsters.
In game texture alignment using the R3D Edit mode.