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System dynamics program with additional features for economics
...Minsky is good for demonstrating mathematics too, with the most "math-like" interface in system dynamics.
Sign up to Minsky's Patreon page (for as little as $1 a month) at https://www.patreon.com/Ravelation/. This creates a user community, which SourceForge doesn't facilitate.
...Active development and discussion takes place on GitHub and OSGeo Discourse. You can also connect directly with the companies supporting the development.
Source code available on github https://github.com/geonetwork/
Create charts by retrieving data from Stata on-the-fly
...SGraph is an open source project and you can download the code from the project web site web site or try the app on-line here: http://sgraph-with-swire.sourceforge.net/
The source project is hosted in GitHub: https://github.com/lomagno/sgraph