Quite Universal Circuit Simulator (Qucs) is an open source electronics circuit simulator software released under GPL. It gives you the ability to set up a circuit with a graphical user interface and simulate the large-signal, small-signal and noise behaviour of the circuit. Pure digital simulations are also supported using VHDL and/or Verilog.
Qucs supports a growing list of analog and digital components as well as SPICE sub-circuits. It is intended to be much simpler to use and handle than other circuit simulators like gEDA or PSPICE.
Read more about Quite Universal Circuit Simulator: Analysis Types, Features At A Glance, Tool Suite, Components, Transistor Models
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