PCBWeb
Pspice
Oregano
Solve Elec
BlackBoard Circuit Designer
PCB Wizard
McCAD 3SPICE
Circuit Simulator
EverDev
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Pspice - OrCAD PSpice technology provides the best, high-performance circuit simulation to analyze and refine your circuits, components, and parameters before committing to layout and fabrication
Oregano - oregano - An electrical engineering tool for GNOME
Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.
BlackBoard Circuit Designer - Help building prototypes on so called breadboards easily
PCB Wizard - PCB Wizard 3 is a powerful package for designing single-sided and double-sided PCBs.
McCAD 3SPICE - Mixed Mode Simulation