The NEOS Server offers COPT
Cardinal Optimizer for the solution of linear programming (LP) and
mixed-integer linear programming (MILP). Acceptable input formats for COPT on
the NEOS server include AMPL, GAMS, LP, MPS, and NL formats.
Details on COPT can be found on the COPT website.
The user must submit a model in LP format to solve a linear program.