PartSim

The gEDA project has produced and continues working on a full GPL'd suite and toolkit of Electronic Design Automation tools. These tools are used for electrical circuit design, schematic capture,...

Proteus PCB design combines the ISIS schematic capture and ARES PCB layout programs to provide a powerful, integrated and easy to use suite of tools for professional PCB Design.. All …

KTechlab is an IDE for microcontrollers and electronics.

Altium Designer(currently version Winter '09) is an all in one sofware for PCB design. From schematic to PCB as well as FPGA programmation, signal integrity check, mixed analog/digital simulation, this …

The Quite Universal Circuit Simulator (QUCS) is an integrated circuit simulator allowing the simulation and graphical presentation of results of large-signal, small-signal and noise behavior in circuits.

The World’s Most Powerful Free Schematic and PCB Layout

We build the pickaxes of hardware engineering. Ideation tools, schematic capture, PCB layout, design hosting, parts library management, and affordable prototyping.

LTspice IV is a high performance Spice III simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators.

NI Circuit Design Suite software improves the PCB design process by integrating capture, simulation, and layout into a single toolchain with NI Multisim and Ultiboard software. Multisim easily captures...

Livewire is a sophisticated software package for designing and simulating electronic circuits. Switches, transistors, diodes, integrated circuits and hundreds of other components can all be connected...

TINA Design Suite is a powerful circuit simulation package for analyzing, designing, and real time testing of analog, digital, VHDL, MCU, SMPS, RF, communication, optoelectronic and mixed electronic circuits...

This java applet is an electronic circuit simulator.

PCBWeb is a free browser-based CAD application for designing and manufacturing electronics hardware.

Sketch, simulate, and share your circuits, entirely in your browser -- no install required. Easy schematic capture and powerful SPICE-like, mixed-mode circuit simulation helps EE students, electronics...

Ngspice is a mixed-level/mixed-signal circuit simulator. Its code is based on three open source software packages: Spice3f5, Cider1b1 and Xspice. Ngspice is part of gEDA project, a full GPL'd suite …

The Cadence OrCAD product line provides affordable, high-performance PCB design tools that boost productivity for smaller design teams and individual PCB designers.

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

Circuit Wizard is a revolutionary new system that combines circuit design, PCB design, simulation and CAD/CAM in one complete package.

oregano - An electrical engineering tool for GNOME oregano is an application for schematic capture and simulation of electronic circuits. The actual simulation is performed by Berkeley Spice, or GNUcap …

circuits.io is an in-your-browser circuit design tool, that makes it fun and easy to design, share and produce electronic circuits.

Its advanced simulation engine can handle both analog and digital circuits and features realtime always-on analysis. It is the perfect companion to students, hobbyists, and engineers. You use it as …

SIMetrix/SIMPLIS enables engineers to design and simulate switching power electronics systems

As IC geometries continue to shrink, the need for an accurate circuit simulator is critical. Designers require a highly accurate circuit simulator to precisely predict the timing, power consumption, functionality, …

Cadence® Pspice® is a full-featured, native analog and mixed-signal circuit simulator. The demo version limits the number of nodes (and other features?) available.