GZDoom is an advanced port of the Doom source code tailored for modern Macintosh systems. This program enhances the classic Doom experience by providing improved graphics, smoother controls, and a variety of unique content. Notably, GZDoom serves as an engine rather than a standalone game, allowing users to run various titles built on the Doom engine, including Ultimate Doom, Doom 2, Heretic, and Hexen, provided they have the original game files.

The enhancements in GZDoom include support for all screen resolutions, texture improvements, free mouse viewing, and the incorporation of translucent objects. Utilizing modern technologies such as Vulkan and OpenGL 4, GZDoom revitalizes the classic gameplay with a visually impressive upgrade. With the ability to play solo campaigns or engage in multiplayer sessions with up to seven other players, GZDoom stands out as an optimal choice for both nostalgic players and newcomers.