Mac users interested in Snes9x version 1.53 for mac 10.6.8 generally download:
Snes9x is a Super Nintendo emulator for a variety of platforms. It works under Windows, Mac OS X and Linux, among others. If my memory isn't failing me, Snes9x was first released for Windows, hence the last two letters of the name. Its Mac version works very well, and it has a whole array of features.