Qucs-S Alternatives

Solve Elec is a free educational program to draw and analyze electrical circuits.

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

oregano - An electrical engineering tool for GNOME

PCBWeb is a 100% free Windows desktop CAD application for designing and manufacturing electronics...

Help building prototypes on so called breadboards easily

PCB Wizard 3 is a powerful package for designing single-sided and double-sided PCBs.

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.

Mixed Mode Simulation

Electronic circuit simulation for the Mac, support and downloads site.

PCB Artist is an advanced PCB layout software that comes in handy if you are an engineer or engineering student.

Xyce is an open source, SPICE-compatible, high-performance analog circuit simulator, capable of solving extremely large circuit problems by supporting large-scale parallel computing platforms.

LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits.

Ngspice is a mixed-level/mixed-signal circuit simulator.