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DirectQ

From Quake Wiki

DirectQ
Author: mh
Based on: GLQuake
First release: here
Newest release: here
Website: here

A port of GLQuake to Direct3D with emphasis on bug fixes, being faithful to the original software Quake look, increased limits, and player-friendliness.

This is primarily intended for use on PCs and laptops that have integrated Intel 3D cards which either choke on, or give incredibly poor performance with, OpenGL-based Quake engines. It is also suitable for more general use on any machine, of course.

The engine would be the base for the Direct3D code in Mark V, another engine