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

Logisim - Logisim is an educational tool for designing and simulating digital logic circuits.

Circuit Tree - Design and order Boards in Minutes

Digital - A simulator for digital circuits.

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

Logicly - - Design circuits quickly and easily with a modern and intuitive user interface with drag-and-drop...