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: Builtin libraries use the new UCRTBase C runtime. Compatibility mode used when reporting Windows version. Better support for deinformation in PE files. Support for linguistic case mappings. More attributes supported in WebServices. Various.