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GFortran - GCC Wiki - GCC, the GNU Compiler Collection
GNU Fortran - GNU Project
Installing GFortran — Fortran Programming Language
Top (The GNU Fortran Compiler)
GNU Fortran - Wikipedia
GFortran in Fortran Wiki
About GNU Fortran (The GNU Fortran Compiler)
Compilers — Fortran Programming Language
gfortran(1) - Linux manual page - man7.org
Installation of GFortran in Windows 10 - GitHub Pages