Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
OrCAD - OrCAD is a great tool for creating electronic designs that sell.
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.
PADS PCB Design - Best-in-class PCB design tools at unbeatable prices
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...