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ngspice

Open-source mixed-signal SPICE circuit simulator

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Last commit16 Oct 2026
LicenceBSD-3-ClausePer the project
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From SourceForge, fetched 19 Oct 2026.

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ngspice is the open-source SPICE simulator used inside KiCad, Qucs-S and other tools. It handles analogue, digital and mixed-signal simulation and supports many commercial device models.

Fit: files and licence

Runs onWindows, macOS, Linux
Commercial useAllowed
Open-source licence (BSD-3-Clause): the Open Source Definition rules out restrictions on fields of use, including business use.

Sources: opensource.org/osd. “Runs on” is from this listing. Blank means we haven't found it in official docs yet, not that it's unsupported.

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