Doom Delta is a gameplay mod for the GZDoom sourceport that aims to incorporate various elements from the pre-release iterations of Doom. This includes early HUD designs, unused weapon and monster concepts, and four unique playable characters.

• Four unique playable characters from the Doom Bible!
• Three fully functional HUD styles, including the helmet HUD from Doom 0.3!
• Weapons such as the Rifle/Bayonet, the Dark Claw, and the Unmaker!
• New enemies such as the Gargoyle and The Blob!
• Score system with treasure items and kill bonuses!
• Reimagined powerups such as the shields and the Chaos Field!
• Vanilla-style sound design!

Yep!

Doom Delta 2.4.0 requires GZDoom v4.7.1 to run. You will also need Doom, of course! Either Doom or Doom II will work.