apps.microsoft.com/windows/en-us/app/icircuit/4041b312-408b-...

iCircuit is the easy to use electronic circuit simulator and designer - the perfect tool for students, hobbyists, and engineers.

Its advanced simulation engine can handle both analog and digital circuits and features realtime always-on analysis ...

www.partsim.com

PartSim is a free and easy to use circuit simulator that includes a full SPICE simulation engine, web-based schematic capture tool, a graphical waveform viewer and Digi-Key that runs in your web browser.