brutal-doom : A mod that attempts to make Doom faster placed, harder, gorier and more violent. ( http://www.moddb.com/mods/brutal-doom/ )
freedoom : Freedoom - Open Source Doom resources ( http://www.nongnu.org/freedoom/ )
zdoom : ZDoom is an enhanced port of the official DOOM source code ( http://www.zdoom.org )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a heather
For Paludis use this rsync : rsync://gentoo.zugaina.org/heather-portage
If you have a problem : ycarus(-at-)zugaina.org