Screaming Penguin - Source Does Matter

PearPC is a emulator that runs, Mandrake Linux 9.1 for PPC
(Runs very well), Darwin for PPC (Runs well) and Mac OS X 10
(Runs well with some caveats). It is supported on, POSIX-X11
(Linux, ...), Win32. PearPC is still being developed and worked
on, but it does look very cool. Check it out HERE.