Not sure if you meant to have a comma in there or if you're incorrectly saying google made coin-or. Coin-Or is a separate project. It's the fastest free/open s

Not sure if you meant to have a comma in there or if you're incorrectly saying google made coin-or. Coin-Or is a separate project. It's the fastest free/open source LP & MILP solver I've seen, but has a terrible CLI if you don't want to use it as a C++ library. It's easiest as part of the Open Solver Excel plugin. Lp_Solve isn't as fast I don't think, but the CLI is much easier to use and better documented. I prefer to use a scripting language language to write my own .lp models and send that directly to the solver. There are lots of libraries to do that, but it's easier for me to write code I fully understand than to try to learn someone's library. Google has the "Or-tools" solver which I haven't used, but have friends which do use it and like it.