I can already say to you that GLPK is open source, automatically installed, and, in general, a great choice for toy models. But for really big models, you want an academic license of either Gurobi, CPLEX, or Xpress. For these you need a commercial or academic license from their official site. I use Gurobi, so each 2~3 months I need to call a command from inside my university’s network with a new license code that I get from their site to re-validate the Gurobi installation in my machine.
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