Digital - A simulator for digital circuits.
BOOLR - Open-source digital logic simulator
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.
Wired Logic - Wired Logic is a pixel based logic simulator.
Logicly - - Design circuits quickly and easily with a modern and intuitive user interface with drag-and-drop...
Atanua - Atanua is a real-time logic simulator, designed to help in learning of basic boolean logic and...