ZSNES is a Super Nintendo emulator programmed by zsKnight and _Demo_. It currently runs on Windows, Linux, FreeBSD, and DOS.
ZSNES supports Super Nintendo features which are very hard to emulate, like DSP1 emulation (Mario Kart), SuperFX emulation (StarFox) and now even C4 emulation (Megaman X3). These features make ZSNES the most compatible Super Nintendo emulator available. [advt]
The sound is also great as ZSNES allows some special tricks like sound interpolation and a low pass filter. You can get 44khz Stereo sound with ZSNES, but you must have a fast PC for that.