MorphGear was ever a very powerful and celebrated multiple game consoles universal emulator (basically a frontend) that lets you emulate different console systems by using different emulator modules. It is capable of emulating GameBoy Color, GBA, NES, SNES, GameGear, MasterSystem, Genesis and TG-16. Especially, it's pretty easy to configure and has very good graphics & sound effects, as well as ROM compatibility.

MagicEngine (MAGIC-ENGINE) is a video game emulator from France, designed for NEC's PC-Engine (AKA: TurboGrafx-16) game console - the first console has CD games, which can almost emulate the PC-Engine/TurboGrafx-16 most perfectly. We usually call it PCE emulator for short.