PICSimLab is a realtime emulator for PIC, Arduino, STM32, ESP32, ...
Growth-grammar related Interactive Modelling Platform
OpenNum lets you distribute solvers with a nice graphical interface
PySCeS Constraint Based Modelling
Neurons to Algorithms - A neural modeling and simulation workbench
A cross-platform tool for creating and editing custom weather files.
A Library for Interactive Modelling and Visualisation
PetriNetExec a library for embedding Petri Nets into Java applications