GZDoom

GZDoom, sports advanced hardware (OpenGL) and enhanced software rendering capabilities, while its sister port QZDoom serves a test bed for new (stable) features.

GZDoom is a 3D-accelerated Doom source port based on ZDoom coded and maintained by Christoph Oelckers.

Merges your Doom IWADs (Doom, Doom 2, Final Doom, Master Levels, etc.) into a single IWAD, allowing players to switch between games without relaunching.