Emulation on Mac OSX

I hope this is in the right forum... sorry if its not!

Anyway, my dad is a graphic designer, so he only computers we have in our house are Apple Mac's running OSX.

I've downloaded a few Emu's and Rom's for various different systems in the past for OSX, but none of them have been very good.

Can anyone reccomend any good ones for the Mega Drive + Saturn + most if not all Nintendo systems?

Thanks in advance... :)

You might find a lot here or there

MegaDrive: Generator & Genesis Plus
Saturn: There'nt good Saturn emulators for Mac.
GBA: Visual Boy Advance
Nes: FCUltra, Nestopia, RockNes
SNES: Snes9x
N64: Mupen64 & sixtyforce, but far from PC's Project64