OpenModelica is described as '– A Free Modelica Environment!
OpenModelica is an open-source Modelica-based modeling and simulation environment intended for industrial and academic usage. Its long-term development is supported by a non-profit organization – the Open Source Modelica Consortium (OS' and is a circuit simulator in the education & reference category. There are more than 25 alternatives to OpenModelica for a variety of platforms, including Windows, Linux, Mac, Web-based and Python apps. The best OpenModelica alternative is MATLAB. It's not free, so if you're looking for a free alternative, you could try Spyder or SciPy. Other great apps like OpenModelica are Circuit JS, NumPy, LTspice and CircuitJS1 Desktop Mod.