Brutal Doom

Brutal Doom (also stylized as Brütal Doom) is a gore-themed WAD for Skulltag and GZDoom. It features many new graphical effects, such as new death animations, flares and 3D blood effects for OpenGL, but also does change the gameplay by revamping the weapons (which, unlike original Doom, need to be reloaded), adding new hitboxes for headshots and featuring 3rd person "fatalities" when punching enemies in berserk state.