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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.
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
OpenModelica - OpenModelica – A Free Modelica Environment!
QUCS - Qucs, briefly for Quite Universal Circuit Simulator, is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behaviour of the circuit.