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
DipTrace - DipTrace - Professional Schematic Capture and PCB Design Software
Oregano - oregano - An electrical engineering tool for GNOME
Altium Designer - PCB Design Software
Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.
Autodesk EAGLE - Autodesk EAGLE is an electronic design automation (EDA) software.