MinGW
MinGW ("Minimalistic GNU for Windows") is a port of the GNU Compiler Collection (GCC) and GNU Binutils. It provides a complete Open Source programming toolset which is suitable for the development of native MS-Windows (x86) applications, which do not depend on any 3rd-party C-Runtime DLLs. MinGW compilers provide access to the functionality of the Microsoft C runtime and some language-specific runtimes. MinGW, being Minimalist, does not, and never will, attempt to provide a POSIX runtime environment for POSIX application deployment on MS-Windows. If you want POSIX application deployment on this platform, please consider Cygwin instead.