GLPK - the GNU Linear Programming Kit

GLPK is a library of ANSI C routines for solving large scale
linear programming problems using the revised simplex method.

Older versions of GLPK are archived in the directory
old-gnu/glpk/ on ftp.gnu.org; this may be mirrored on some
(but not all) mirrors of ftp.gnu.org.

- FSF staff