assaultcube : Free multiplayer FPS based on the Cube engine ( https://assault.cubers.net/ )
crispy-doom : A limit-removing enhanced-resolution Doom source port based on Chocolate Doom ( https://github.com/fabiangreffrath/crispy-doom )
etlegacy : Wolfenstein: Enemy Territory 2.60b compatible client/server ( https://www.etlegacy.com/ )
far-cry-demo : Famous game from 2004, developed by CryTek ( https://en.wikipedia.org/wiki/Far_Cry_(video_game) )
openspades : Open-source voxel FPS ( https://openspades.yvt.jp/ )
quakespasm : Modern, cross-platform Quake 1 engine based on FitzQuake ( https://quakespasm.sourceforge.net )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a guru
For Paludis use this rsync : rsync://gentoo.zugaina.org/guru-portage
If you have a problem : ycarus(-at-)zugaina.org