KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
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
gEDA Project - All about General Public License (GPL) and Electronic Design Automation (EDA) software tools
Circuit Simulator - Animated electronic circuit simulator using ideal components to visualize voltage and current.
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
VeroRoute - Cross-platform software for producing Veroboard (stripboard), Perfboard, and single-sided PCB...