The original circuit simulation software, called the Simulation Program ... not all of which are as open or free as we might like. Qucs is a GPL circuit simulator. And if you want the GUI option ...

[FightCube] wrote in recommending a very helpful piece of circuit simulation software for those of ... is fairly easy to use, and best of all, it’s free. He has shared one basic circuit he ...

Using EM simulation to accelerate and simplify your design workflow to create better designs.