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
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
PCBWeb - PCBWeb is a 100% free Windows desktop CAD application for designing and manufacturing electronics...
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.