We support operating systems that not even Microsoft and Apple themselves support anymore, such as macOS X on PowerPC Macs, and RetroArch being available on Windows OSes as far back as Windows 95.
PCSX-df PlayStation emulator based on the PCSX Project. RetroArch can run on the usual platforms like Windows, Mac OS X and Linux, but it stands alone in that it can support far more platforms beyond just that. MAME OS X is a native Mac OS X port of MAME, designed to take full advantage of OS X-specific optimizations.