That’s the reason for the vast versions of SPICE available now decades after the original was released, not all of which are as open or free as we might like. Qucs is a GPL circuit simulator.

A brief overview of the history and operating principles of vacuum tubes is discussed, after which Dr. Stephen Dyer shows how ...

Modelithics, the leading independent provider of accurate RF/microwave device and component models, is pleased to launch the NEW Modelithics COMPLETE+3D Library for Keysight Advanced Design System ...

With this software, you can set ranges for various circuit components ... However, we appreciate the free release of this powerful simulator that can give LTSpice a run for its money.