CALCONIC_ - Build & add interactive calculators to your website! Choose from more than 50 premade calculators or build your own from scratch. No coding required. Free plan available. Zapier Integration. Publish Anywhere.
EMSO simulator - EMSO simulator is an equation-oriented process simulator with a graphical interface for modeling...
NI AWR Design Environment - NI AWR Design Environment is a circuit design and simulation solution.
Altair Activate - Altair Activate is an open & flexible tool for rapidly modeling and simulating products as multi-disciplinary systems in the form of 1D models (expressed as signal-based or physical block diagrams), optionally coupled to 3D models.
Mapnik - Mapnik is a Free Toolkit for developing mapping applications.
Minsky - System dynamics program with additional features for economics