[Sticky] MAME & Arcade Emulator
Before you download anything, you're going to need the Emulator first. Download, Install/Extract package, and place all downloaded ROMS in the ROM folder within the emulator. Do not extract the ROM files, leave the ZIPS as they are. Start your Emulator, hit f5 to refresh and add all your games to the system.
all other platforms, Apple, Linux ect download