Minimalist GNU For Windows. Includes MinGW: A collection of freely available and freely distributable Windows specific header files and import libraries combined with GNU toolsets that allow one to produce native Windows programs that do not rely on any 3rd-party DLLs. And MSYS: A Minimal SYStem to allow the typical POSIX/Bourne configure script to execute to create a Makefile so that you can execute make.....(free).....