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Circuit Tree - Design and order Boards in Minutes
Digital - A simulator for digital circuits.
CircuitLab - Sketch, simulate, and share your circuits, entirely in your browser -- no install required.
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.
BOOLR - Open-source digital logic simulator
gEDA Project - All about General Public License (GPL) and Electronic Design Automation (EDA) software tools