Qucs project: Quite Universal Circuit Simulator
Circuit simulator with Qt-based GUI.
The Qucs GUI is well advanced and allows setting up schematics and presenting simulation results in various types of diagrams. DC, AC, S-parameter, noise and transient analysis is possible, mathematical equations and use of a subcircuit hierarchy (with parameterised subcircuits) are available. Qucs can also import existing SPICE models for use in your simulations.
Sun Feb 23 22:46:53 2014 - permalink -
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http://qucs.sourceforge.net/index.html