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: Unicode data updated to Unicode 10.0.0. Nicer looking default mouse cursors. Persistent connections support in WinHTTP. Message Framing protocol support in WebServices. Improved metafile support in GdiPlus. Deregisters support in x86-64 exception handling. Anti-aliasing improvements in DirectWrite. Various.