Qucs is an integrated circuit simulator which means you are able
to setup a circuit with a graphical user interface (GUI) and simulate
the large-signal, small-signal and noise behaviour of the circuit.
After that simulation has finished you can view the simulation results
on a presentation page or window.
The software aims to support all kinds of circuit simulation types,
e.g. DC, AC, S-parameter, harmonic balance analysis, noise analysis,
Qucsator, the simulation backend, is a command line circuit
simulator. It takes a network list in a certain format as input and
outputs a Qucs dataset. It has been programmed for usage in the Qucs
project but may also be used by other applications.