DigitalJs: Digital circuit simulator in browser
Very curious, what is it that makes circuit simulation so interesting to HN readers? I'm certainly biased and have spent years on the problem as one of the developers of CircuitLab (YC W13) -- for example try: https://www.circuitlab.com/editor/53xa3r/ (just click "Simulate" and "Run Time-Domain Simulation") -- but in general I'm surprised at the high level of interest from this audience. Is your interest in electronics more theoretical or practical? What's your existing level of knowledge? What do you want to learn? What do you want these tools to be able to do?