dolphin : Gamecube and Wii game emulator ( https://www.dolphin-emu.org/ )
dosbox : DOS emulator ( http://dosbox.sourceforge.net/ )
gnome-video-arcade : A simple MAME front-end for the GNOME Desktop Environment ( http://mbarnes.github.com/gnome-video-arcade/ )
sdlmame : Multiple Arcade Machine Emulator + Multi Emulator Super System (MESS) ( http://mamedev.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a gentoo-playground
For Paludis use this rsync : rsync://gentoo.zugaina.org/gentoo-playground-portage
If you have a problem : ycarus(-at-)zugaina.org