MinGW - Minimalist GNU for Windows 32/64 bit download
MinGW (or Minimalist GNU for Windows) is a native Windows port of the GNU Compiler Collection (GCC), is a free and open source software development environment to build Windows applications.
You can download MinGW 32 bit & 64 bit version on the official web site of the project MinGW in SourceForge :
https://sourceforge.net/projects/mingw/