I wrote a textbook on using system dynamics for supply chain management. Models and diagrams are in https://github.com/Data4DM/SD4SCM. In edition2, we're preparing an online simulator as below <iframe id="theFrame" src="https://htmlpreview.github.io/?https://github.com/Data4DM/BayesSD/blob/master/dynamic_testing/index.html" style="height:1000px;width:2000px;" frameborder="0"> </iframe>