Re: [Trisquel-users] Do DRM free games matter even if the game is non-free?

[anthk]

"Like Id Software's Old ID tech engines and Ken-Silverman's Build engine  
(technially non-free, Because it's free for non-commercial use only.) "

http://wiki.eduke32.com/wiki/Frequently_Asked_Questions
Eduke32 is GPL. Also, you have forks of Eduke32 for Redneck Rampage.

And , more awesome, you have a Blood reimplementation for Eduke32.