If speed isn't an issue you could try Cygwin which comes with gcc which includes a fortran compiler. I mention speed because IMO apps running under cygwin are noticably slower than 'native' ones. And ...
MinGW is a popular Windows programming environment for Minimalist GNU for Windows. It combines the acclaimed GNU Compiler Collection (GCC) with Windows-specific libraries to provide a comprehensive ...
…the first implementation of the IMSL Fortran Numerical Library qualified for Microsoft Windows(r) Compute Cluster Server (WCCS) 2003. Built with Absoft’s Pro Fortran compiler, the newly qualified ...