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Xcos - Xcos is a graphical editor to design hybrid dynamical systems models.
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
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.
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
OpenModelica - OpenModelica – A Free Modelica Environment!
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.