quake-engine topic
OGS
An open-source GoldSrc engine clone (Clean authentic reimplementation without using reverse-engineered code)
QCVM
Bite-sized QuakeC VM written in C
Watch_Quake
Quake 1 port for Apple Watch
Watch_Quake2
Quake 2 port for Apple Watch
dm-engine
DarkMatter is a new source port for QUAKE III: ARENA, based on Quake3e (https://github.com/ec-/Quake3e). It is part of an ambitious project to ultimately bring the gameplay experiences of older QUAKE®...
QuakeEngines.github.io
Structured List of Quake Engines
DIYQuake
An attempt to understand how Quake engine works
GLQuake3D
WinQuake/GLQuake-based source-port of game Quake