OpenEmu makes it exceedingly easy to get you up and running your favorite older generation titles from a multitude of systems such as Atari, Nintendo, Sega and even arcade systems. OpenEmu is a free (you can donate if you like their software) and open source graphical front end for many software emulators (which in turn are also open source). Our favorite emulation software comes from OpenEmu and we'll show you how to get it up and running. You're going to need some emulation software to help you get started. If you're thinking about your childhood games on Atari, ColecoVision, or that old Commodore 64, you can relive those memories with retro gaming on your Mac.