potentially divisive question as results vary.
Darkplaces with high res textures for a modern but authentic feel. the physics are a little off but it’s pretty.
QuakeSpasm gameplay compares with Fodquake in terms of graphical look and options, and supports the single player campaign. It’s a cross-platform Quake 1 engine based on FitzQuake. John Romero refers to this as “one of the best source ports”.
ezQuake is interesting and if not a vastly different take. still very worth looking at.
