Currently there are a couple good emulators out there. You can dl the Windows version from this site, or follow the Web Site link to get the other versions. Vote for me at Top 100 Gaming.

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SNES9x - Web Site - (Linux, Win, Mac, MS-Dos)
ZSNES - Web Site - (Win, MS-Dos)

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These are the only ones worth your time, but there are others out there.