As has been stated in this thread, MorphOS already runs on Mac minis and other models such as PowerMac G4 has been announced. If you are not familiar with MorphOS, you could say it started as an AmigaOS close and has matured from there. MorphOS is highly compatible with AmigaOS 3.x applications. Pretty much anything system friendly will run. Old school games bang the hardware so they would require emulation (UAE).