GZDoom is an improved port of the official Doom source code, optimized to work perfectly in any version of Windows after 95, which also adds a few improvements over the original engine.
It is important to emphasize that GZDoom is only an engine. In other words, it is not a complete game in itself. Instead, it is capable of running almost all titles that use the Doom engine, such as Ultimate Doom, Doom 2, Heretic or Hexen, as long as we have the original files.
Among the most striking improvements with respect to the original, we find support for all kinds of resolutions, the improvement and increase of some textures, the possibility of using the mouse-free view, or the use of translucent objects.
GZDoom is the best way to enjoy Doom today. Whether we want to play a solo campaign to any of the titles that use the Doom engine, or if we want to play a multiplayer game with up to seven other players, GZDoom is the best option.