Wine is a program which allows running Microsoft Windows programs
(including DOS, Windows 3.x and Win32 executables) on Unix.  It consists
of a program loader which loads and executes an Microsoft Windows binary,
and a library that implements Windows API calls using their Unix or X11
equivalents.  The library may also be used for porting Win32 code into
native Unix executables.

Wine is free software, and after version 20020228, its license (contained
in the file LICENSE) changed from BSD style to LGPL.  For a BSD-style fork
of Wine, see the emulators/rewind package.