Risen3D is an advanced Doom port by Graham Jackson based on Jaakko Keranen's Doomsday port. Risen3D should be used as a stand alone port as it does not require any of the Doomsday binaries.
Fantastic fun from a sadly forgotten extension of the Doom series built on a custom engine.
Get the updated version at drdteam though and if interested there were a few custom maps and mods made for it as well that you can scrounge up with a little detective work.