Haven't had a chance to try it out myself yet, but ZSNES is back. The original develops are back and have rebuilt the super popular Super Nintendo (SNES) emulator. Originally ZSNES' popularity stemmed from its incredible speed even on lower-end devices. Super ZSNES brings a bunch of new features, including what they are calling the Super Enhancement Engine, which includes wide screen (actual 16:9 rendering showing sprites that were "off screen" on the old 4:3 screens), high resolution (smart auto upscaling), and even support for 3D.
Super ZSNES