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Help: difference between Beopt & OpenStudio

I am new to building energy modeling. I'm doing a research project on residential energy efficiency in Saudi Arabia and will use a building energy model in that research. Am I correct in that both Beopt and OpenStudio are front-ends to EnergyPlus? But that Beopt allows for optimizing a building design/technologies on cost-effectiveness?

But then, it seems that you can use Genopt with EnergyPlus (presumably in conjunction with OpenStudio) to optimize as well.

So what are the pros and cons of Beopt vs OpenStudio/Genopt?

And if I've misunderstood these options, please correct me. Thanks.