nuPSX is described as 'Experimental PlayStation 1 emulator and debugger written in Zig, built as a learning exercise to explore Zig's capabilities and PSX hardware architecture. Still in early development with no intention of becoming usable by the general public' and is an app. There are six alternatives to nuPSX for a variety of platforms, including Windows, Linux, Mac, Android and Android Tablet apps. The best nuPSX alternative is DuckStation, which is free. Other great apps like nuPSX are ePSXe, PCSX-Reloaded, StarPSX and ScePSX.