FreeCircuitSim is described as 'Browser-based circuit simulator with animated current flow, oscilloscope, 50+ components, 360+ examples, guides, and no account or download' and is a circuit simulator in the education & reference category. There are more than 25 alternatives to FreeCircuitSim for a variety of platforms, including Windows, Linux, Mac, Web-based and Android apps. The best FreeCircuitSim alternative is Circuit JS, which is both free and Open Source. Other great apps like FreeCircuitSim are QUCS, SimulIDE, LTspice and Pspice.