Taking a different stance on Super Nintendo emulation, bsnes is an emulator that has dedicated itself to 100% accurate emulation. Unlike other emulators that often put the most effort towards the most popular games on their respective platform, bsnes aims to have every game run exactly as it would on a real console. As of version 0.87, it has accomplished this. bsnes currently offers 100% compatibility with every official Super Nintendo game that was ever commercially released.
bsnes features OS X and Linux ports and also emulates both NES and Game Boy Color games.
Note: If for any reason you end up having frame rate issues while running the games with the 64bit version please use the 32bit one. The 64bit version is meant for more accurate emulation so it requires more processing power.