Beautiful Doom is the grandfather of most enhancement mods, including the well-known Brutal Doom. First released back in 2008 this mod aims to improve each and every single object in Doom, making them smoother, more impressive visually and having better sounds while retaining VANILLA gameplay. Keeping original vanilla gameplay is the core of Beautiful Doom. You will see smoke, casings, debris, hugely enhanced gibbing system, smooth weapon animations, but it will all play the same as vanilla Doom plays with (G)ZDoom. However, for those, who don't like fully vanilla things, there are two player classes: the 'Vanilla Guns' class will give you guns that only look better but act the same as original Doom guns. The 'Enhanced Guns' class introduced as number of changes: for example fist and pistol are slightly more effective, and many weapons have alternative attacks which, while not really more powerful, provide certain tactical variety. Choose whichever you want!
A video description of the main new features of Beautiful Doom 6.2.1.