A circuit simulator with graphical user interface (GUI)
Digital Circuits Design and Simulation
Real Time Electronic Circuit Simulator.
Integrated Development Environment (IDE) for learning HDL
Community driven PCB Layout and Schematic capture software
Digital circuit simulator
AVR simulator IDE
GeckoCIRCUITS is THE circuit simulator for modeling power electronics
The Future of the Java Circuit Simulator
Circuit simulators like SPICE for low memory computers
Visually build and simulate boolean logic circuits