Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
QUCS - Qucs, briefly for Quite Universal Circuit Simulator, is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behaviour of the circuit.
LibrePCB - LibrePCB is a free EDA software to develop printed circuit boards.
Autodesk EAGLE - Autodesk EAGLE is an electronic design automation (EDA) software.
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