Standalone which includes new features and doesn't require any additional files anymore. Only requires Dosbox or similar. Among the new features are...
Apocalypse aftermath - endless hordes of demons roam around and hunt down the remaining people of earth. You have to save the last living undead people who survived this and defeat an army of demonic creatures. You are Brick Sledge and even a Sledge Hammer can't stop you from standing your ground.
Demon Hunter is possibly the first mod for the old Hovertank 3D. Although made at the end of 2006 it is quite less rotten. It features an apocalyptic sci-fi/fantasy setting with all around changes.
-new hand-drawn pixel graphics in EGA style
-20 new claustrophobic levels
-apocalypse now story
-new sounds with several changes
-animated weapon (wow!)
-and some more