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,
QucsDigi is a wrapper script for digital simulations performed
by Qucs. The program utilizes the FreeHDL compiler in order to
convert the VHDL output of Qucs into a C++ program. Thereafter this
C++ source is compiled and linked to a binary. This binary is then
executed and its VCD output file is converted to a Qucs dataset.