Doom 3, is open-source and I bet it is the most beautiful game.
Why it is not in the list?
Michael, what do you mean about stalled iodoom3 efforts?
iDTech4 was ported to 64 bit, cmake build system, patented code put back, GLSL renderer, etc...
Doom 3 is not open source!
It is commercial, proprietary software.
id Tech 4, the game engine that powers Doom 3 is open source.