dhewm 3 is a Doom 3 GPL source port, know to work on at least
Windows, Linux, Mac OS X and FreeBSD.

The goal of dhewm 3 is bring DOOM 3 with the help of SDL to all
suitable platforms.

Bugs present in the original DOOM 3 will be fixed (when identified)
without altering the original gameplay.

WWW: https://dhewm3.org/