Free solver for MINLP

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I am trying to solve a MINLP and I use Pyomo and Spyder. I am looking for a free global solver for many variables and constraints and it should be matched with Pyomo. Baron is a global solver but it needs license for more than 10 variables and 10 constraints. I used Knitro solver but it is a local solver and it was stuck in local optimum. Which solver do you recommend?

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