Have you tried AMPL and AMPL Studio, both combined with super solvers, like CPLEX; FortMP, FortSP, etc.
If you want to know more solvers, go to NEOS, server for Optimisation.
http://www-neos.mcs.anl.gov/
If you want to download AMPL Studio and related solvers, go to :
www.optirisk-systems.com...