ngspice
A SPICE simulator

What is ngspice?
Where can I download it?

What is ngspice?

Ngspice is a mixed-level/mixed-signal circuit simulator. Its code is based on three open source software packages: Spice3f5, Cider1b1 and Xspice.

Where can I download it?

Ngspice may be obtained from the main ngspice website.