Simply download the emulator for free from the developer website link offered above, open the program drag your ROMs onto the application interface and play. Using OpenEmu couldn’t possibly be made any easier. The developers are currently working towards adding more modern consoles, but as of this writing the following are supported:

It has an iTunes-style menu that runs emulations simply and automatically by detecting the necessary components and housing them directly in the application itself. Towering over the previously complicated and unreliable emulators of the past, OpenEmu is an all-in-one vintage console emulator for Mac OS X 10.7 and up. Emulators up to the sixth generation (GameCube, Playstation 2) are freely available for download and, in a combination of spurious legality and uninhibited awesomeness, so too are the respective ROMs for most of their games. Slide over and take a seat BioShock, because Mario, Super Metroid and Final Fantasy have jumped into their respective time machines and been transported directly to the present and earned their place as legendary classics of the genre. This article will outline the newest, simplest and most free options for classic gaming on all the major consoles of days past.

Enter the new era of classic game emulation for Mac.

N64 emulator roms mac