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Xcos - Xcos is a graphical editor to design hybrid dynamical systems models.
LTspice - LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits.
Altair Activate - Altair Activate is an open & flexible tool for rapidly modeling and simulating products as multi-disciplinary systems in the form of 1D models (expressed as signal-based or physical block diagrams), optionally coupled to 3D models.
Circuit Simulator - Animated electronic circuit simulator using ideal components to visualize voltage and current.
OpenModelica - OpenModelica – A Free Modelica Environment!
Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.