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
LibrePCB - LibrePCB is a free EDA software to develop printed circuit boards.
Oregano - oregano - An electrical engineering tool for GNOME
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
Circuit Simulator - Animated electronic circuit simulator using ideal components to visualize voltage and current.