Lemuroid is an all-in-one emulator that uses Libretro cores, similar to RetroArch below. That means it supports a bunch of systems, including the SNES. This one is a bit easier to use than RetroArch.

[mac2612] has developed a custom retroarch-based firmware for the Leapster ... The default system includes emulators for NES, SNES, GBA, Genesis, Atari 800, and MAME. Performance varies, but ...