dhewm3 is a source port of the original Doom3. It’s known to work on Windows, Linux, macOS, FreeBSD, OpenBSD and AROS, but it should work on (or be easily portable to) any system that supports OpenGL 1.4 with ARB shaders, SDL and OpenAL.

This port looks great combined with upscaled textures.

Here’s a video where someone threw together dhewm3 with HD textures, and the reshade wrapper with some tweaked lighting. Looks deliciously frightening!