LibrePCB - LibrePCB is a free EDA software to develop printed circuit boards.
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
XCircuit - XCircuit: Home Page
Circuit Simulator - Animated electronic circuit simulator using ideal components to visualize voltage and current.
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
VeroRoute - Cross-platform software for producing Veroboard (stripboard), Perfboard, and single-sided PCB...