You can tweak the game ROMs to perform some non-game functions :).Ability to save game progress and start from the last save.Nestopia is a simple, lightweight yet powerful free NES Emulator for Mac OS X.Īs Nestopia is concentrated only on NES Games emulation, it offers some extra features such as – But no such problem exists with Nestopia. Though OpenEmu is excellent, it sometimes takes time to load and needs to be clicked on “Reopen” to launch it.