Gfortran

gfortran is the name of the GNU Fortran compiler, which is part of the GNU Compiler Collection (GCC). gfortran has replaced the g77 compiler, which stopped development before GCC version 4.0. It includes support for the Fortran 95 language and is compatible with most language extensions supported by g77, allowing it to serve as a drop-in replacement in many cases. Parts of Fortran 2003 and Fortran 2008 have also been implemented.