The Modelica Association is a non-profit that publishes the specification, the standard library and all conference proceedings for free. We sell merch in part because people in the Modelica community like the language and like to show it but also as a way to fund the not for profit activities.

Downvoted but relevant...nothing says corporate bullshit like a niche programming language with logos and merch featured far more prominently than examples or explanation...

Just to be clear, there is absolutely nothing "corporate" about that web site. It is a non-profit organization.

Sorry, I guess that was rude, I don't know anything about it, just a snap judgment of the landing page.