Wine is an implementation of the Windows API on top of X and Unix. It does not require Microsoft Windows, but can use native Windows DLLs if they are available. It provides both a development toolkit for porting Windows source code to Unix as well as a program loader, allowing many unmodified Windows programs to run on x86-based Unixes.
minor feature: Theming support in all builtin programs. All remaining CRT math functions imported from Musl. MP3 support requires libmpg123 also on macOS. Support for codepage 720 (Arabic). Various.