From Quake Wiki

Author: Ozkan Sezer et al.
Based on: Fitzquake
First release: Feb 20 2010
Newest release: June 6 2018
Website: quakespasm.sourceforge.net

QuakeSpasm is a cross-platform Quake engine based on the SDL port of Fitzquake. The main focus is on portability, bug fixes and improvements without breaking backwards compatibility.

Binaries for Windows, Linux and Mac OS X are provided.