higan (the new name to bsnes, while bsnes is still the name of the SNES emulator in higan) is a Nintendo multi-system emulator created by byuu, and supports the following platforms:
-Nintendo NES and Famicom
-Super NES and Super Famicom
-.Super Game Boy
-GB, GBC and GBA (requires a BIOS)
This also supports SMC files (so nothing of purifying games).
Includes 3 versions (accuracy, performance and balanced).
Do note that higan is thought to be like a real SNES, so accuracy requires high system requirements (i.e.: A Core 2 Duo processor or higher), so if your computer isn't fast try the performance or balanced modes.