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KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Circuit Tree - Design and order Boards in Minutes
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
CircuitLab - Sketch, simulate, and share your circuits, entirely in your browser -- no install required.
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.
gEDA Project - All about General Public License (GPL) and Electronic Design Automation (EDA) software tools