GNU Circuit Analysis Package

{{Infobox software

| name = GNU Circuit Analysis Package

| other_names = Gnucap

| author = Albert Davis

| latest preview version = 0.35

| latest preview date = {{Start date and age|2006|09|20|df=yes}}

| license = GPL-2.0-or-later

| website = {{url|https://www.gnu.org/software/gnucap/gnucap.html}}

}}

GNU Circuit Analysis Package (Gnucap) is a general purpose circuit simulator started by Albert Davis{{Cite web|title=Gnucap Contributors|url=http://www.gnucap.org/contributors.html|access-date=2021-02-17|website=www.gnucap.org}} in 1993.{{Cite web|title=Gnucap (ACS) Revision history|url=http://www.gnucap.org/history.html|access-date=2021-02-17|website=www.gnucap.org}} It is part of the GNU Project.{{cite web|url=http://directory.fsf.org/wiki/GNU|title=GNU|accessdate=25 June 2012}} The latest stable version is 0.35 from 2006. The latest development snapshot (as of July 2023) is from June 2023 and is usable.

It performs nonlinear DC and transient analysis, Fourier analysis, and AC analysis linearized at an operating point.{{Cite web|title=What is it?|url=https://www.gnu.org/software/gnucap/gnucap-man-html/gnucap-man003.html|access-date=2021-02-17|website=www.gnu.org}} It is fully interactive and command driven. It can also be run in batch mode or as a server. The output is produced as it simulates.

With grant funding from Nlnet,{{cite web|title=Nlnet|url=https://nlnet.nl/project/Gnucap-VerilogAMS/|accessdate=8 July 2023}} the Gnucap project started to implement a first free/libre simulator with Verilog-AMS capabilities. As of July 2023 the model generator covers most of the analog subset and effectively replaces ADMS.