LINDO
Classic LINDO's simple interface and straightforward model expression style make it easy to learn and use. Classic LINDO is appropriate for building and solving moderately sized linear and integer models.
GNU Linear Programming Kit
The GLPK (GNU Linear Programming Kit) package is intended for solving large-scale linear programming (LP), mixed integer progr ...
lpsolve
Mixed Integer Linear Programming (MILP) solver lp_solve solves pure linear, (mixed) integer/binary, semi-cont and special orde ...
Linear Program Solver
An optimization package oriented on solving linear, integer and goal programming problems.