Mac users interested in Download fusion for sega on mac os lion generally download:
Kega Fusion is a very useful console game emulator developed for MAC OS X. Kega Fusion supports the following console models: Sega SG1000, SC3000, SF7000, Master System, Game Gear, Genesis/Megadrive, SVP, Pico, SegaCD/MegaCD and 32X emulator for MAC OS X.