A modern, cross-platform Quake game engine based on FitzQuake.
QuakeSpasm is a *Nix friendly Quake Engine based on the SDL port of the popular FitzQuake. It includes some new features, important fixes, and aims for portability and 64 bit correctness.
Download and install maps/mods from the website quaddicted.com
Quake Injector Qt is an application that you can download and install maps automatically from the website quaddicted.com
Quake Injector Qt installation with quakespasm:
https://www.youtube.com/watch?v=IQ9O0hzh4iQ
Quake Injector Qt installation with Quake_x64_steam:
https://www.youtube.com/watch?v=ziFT1T4N9t4
Easier installation of Quake Injector Qt:
https://www.youtube.com/watch?v=3hPlqJwwFJs