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,
QucsLib is a program to manage Qucs component libraries. On the
left side of the application window the available libraries can be
browsed to find the wanted component. By clicking on the component
name its description can be seen on the right side. The selected
component is transported to the Qucs application by clicking on the
button "Copy to Clipboard". Being back in the schematic window the
component can be inserted by pressing CTRL-V (paste from clipboard).