Project64 is described as 'Nintendo 64 emulator for the Windows platform. It employs a plugin system that allows 3rd party developers to implement their own software' and is a popular app in the Gaming Software category. There are more than 10 alternatives to Project64 for a variety of platforms, including Windows, Linux, Mac, Android and iPhone. The best alternative is RetroArch, which is both free and Open Source. Other great apps like Project64 are Mupen64Plus (Free, Open Source), Nostlan (Free, Open Source), RetriX (Free, Open Source) and Apollo (Free, Open Source).