Wine (Wine Is Not an Emulator) is an implementation of the Windows 3.x and Windows APIs on top of X and Unix. It is a Windows compatibility layer that provides both a development toolkit (Winelib) for porting Windows sources to Unix and a program loader, allowing unmodified Windows 3.1/95/NT binaries to run under Intel Unix systems. Wine works on most popular Unix versions, including Linux, FreeBSD, and Solaris.