@allison I named xonotic, I'm not sure what you're on about.
GNU/Jihad against "FOSS"!!!

Of course all the software you named has freedom issues.

- The licensing on Tromi is very sloppy, so I can't say it's free and they've gone and it appears that they've ripped sound effects from NES Tetris and SiIvaGunner music, which cannot legally be distributed.
- The GNU/Linux version of Dr. Robotnik's Ring Racers should be free software as it seems to be based on SRB2, although I'm not too sure and I'll need to inspect to make sure - although the windows version of SRB2 contained proprietary software last time I checked.
- Xonotic is free software under the GPLv3-or-later although software under unknown licenses is arbitrarily loaded in the online mode.