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A circuit simulator with graphical user interface (GUI)
Qucs is a circuit simulator with graphical user interface. The software aims to support all kinds of circuit simulation types, e.g. DC, AC, S-parameter, Transient, Noise and Harmonic Balance analysis. Pure digital simulations are also supported.
Vectronics is a way to share schematics. It makes quick svg images that can be displayed in a browser and reopened and reedited as a schematic. Hyperlinks can also be added to link to data sheets or source code. It is a simple xml based drawing program .
Qlogico is a digital circuit simulator.
True table, manipulation of boolean expresions, schematic capture and simulation, finite state machines, table of transitions, VHDL.