Approximatrix is the company behind the Simply Fortran IDE and the included packaging of Simply Fortran. Approximatrix offers additional products and services related to numerical computing, statistics, and scientific consulting.
The GFortran wiki contains significant additional information concerning the powerful, open-source compiler. Links are provided to feature information, bug trackers, parallel computing, and integration with other languages.
The GNU Compiler Collection, GCC, is the open-source compiler package that includes the GFortran compiler, which powers Simply Fortran. GCC has been ported to countless architectures and operating systems. Besides C, C++, and Fortran, the GNU Compiler Collection also implements Java and Ada compilers.
Minimalist GNU for Windows, or MinGW, is a port of many GNU userland tools to Microsoft Windows and compatible operating systems. Simply Fortran relies on many of the MinGW packages to implement the necessary tools for a full Fortran development environment.
Open Watcom comprises a collection of first-class compilers and related tools for x86 and compatible processors. FORTRAN 77, C and C++ compilers are shipped with the distribution, targeting 32-bit Windows, MS-DOS, Linux, and a handful of other platforms. Simply Fortran relies on Open Watcom's Make utility for controlling the build process.