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On windows there is LTSpice which is free, has a lot of models, but not open source and ngspice which is open source but it does not have a GUI (although i heard that it can be used with KiCAD).

So i really don't underestand, what would be the advantage of using Qucs ?

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> has a lot of models

That being the important part. Good models, ones someone has validated by comparing measured data on real parts with the model, are not cheap to generate. If the models are not close to reality, when you build what you simulated, it won't work right.

LTSpice has models of, unsurprisingly, most of the parts Linear Technologies makes.

(now Analog Devices)

QucsStudio now "competes" with ADS. It includes HB simulation, EM simulation and models for RF components.

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