KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Circuit Simulator - Animated electronic circuit simulator using ideal components to visualize voltage and current.
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
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
EasyEDA - EasyEDA - Web-based EDA suite; runs in browser.
VeroRoute - Cross-platform software for producing Veroboard (stripboard), Perfboard, and single-sided PCB...