Free (standard conforming) library to model mechanical (1D/3D), electrical (analog, digital, machines), magnetic, thermal, fluid, control systems and hierarchical state machines. Also numerical functions and functions for strings, files and streams are included.
The README.md refers to https://modelica.org/projects which is gone.
https://github.com/modelica/ModelicaStandardLibrary/blob/cf495f8db76b3c4d79e03f09d16d409ad3363255/README.md?plain=1#L36