DukePlus is a game-enhancer and customizer for the EDuke32 port of Duke Nukem 3D. Written by Dan Gaskill (a.k.a. “DeeperThought”), the DukePlus mod provides optional enhancements to the original game as well as giving level-designers a vast selection of new options and effects to utilize in their maps.
Reloading, opengl effects, map customization, custom weapon options, options for enemies, weather options, and oh so much more. If you play Duke3D, this is a must have.