f77/f2c

FTP from netlib.att.com in /netlib/f2c (sources and patches)

g77

FTP from sunsite.unc.edu in /pub/Linux/devel/fortran

ftnchek

FTP from sunsite.unc.edu in /pub/Linux/devel/fortran and tsx-11.mit.edu in /pub/linux/packages/fortran

fort77

FTP from sunsite.unc.edu in /pub/Linux/devel/fortran

Toolpack

FTP from sunsite.unc.edu in /pub/Linux/devel/fortran and tsx-11.mit.edu in /pub/linux/packages/fortran

slatec

http://netlib2.cs.utk.edu

PGPLOT

http://astro.caltech.edu/~tjp/pgplot and FTP from astro.caltech.edu in /pub/pgplot

SciLab

FTP from ftp.inria.fr in /INRIA/Projects/Meta/Scilab

(Older versions of SciLab and PGPLOT can be found on sunsite.)