Circuit Simulator - Animated electronic circuit simulator using ideal components to visualize voltage and current.

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.

iCircuit - Its advanced simulation engine can handle both analog and digital circuits and features realtime...

ECStudio - ECStudio app provides you with features that allow you to learn about the building of electric circuits and electronic circuit simulation so you can calculate various values of circuits right at your fingertips.

Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...

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.