lp_solve is a Mixed Integer Linear Programming (MILP) solver. It is a free (see LGPL for the GNU lesser general public license) linear (integer) programming solver based on the revised simplex method and the Branch-and-bound method for the integers. It contains full source, examples and manuals. lp_solve solves pure linear, (mixed) integer/binary, semi-continuous and special ordered sets (SOS) models.
WWW: http://lpsolve.sourceforge.net
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