From the Vancouver Linux User Group's Science & Engineering Special Interest Group's FAQ (http://www.comsoc.org/vancouver/scieng.html#7) Last Updated: 21 Feb 2001 22:38
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7. Can I compile and run my existing Fortran code under Linux?
In a word, yes.
The GNU Project's g77 (http://world.std.com/~burley/g77.html) compiler works quite well for most purposes. It is a standard component of Red Hat Linux, Caldera Open Linux, and most other Linux distributions. Follow the highlighted link for more details.
A free Fortran 90 compiler for Linux plus other (http://www.psrv.com/linux) freely available compiler tools are available for personal use from Pacific-Sierra Research (http://www.psrv.com/lnxf90.html). F is a subset of Fortran 90 without backward compatibility with Fortran 77. A Linux version is freely available from The Fortran Company (http://www.swcp.com/~walt/ and select Free Software).
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If you need to include graphics routines in your Fortan code, we strongly recommend the PGPLOT package (http://astro.caltech.edu/~tjp/pgplot/)
by Tim Pearson at Caltech.