PICSimLab is a realtime emulator for PIC, Arduino, STM32, ESP32, ...
C++ Library for the Common Image Generator Interface
OpenNum lets you distribute solvers with a nice graphical interface
AVR simulator IDE
vinylsimtool: simulation of vinyl record playback
A software gps simulator
Modeling and Simulation of mPBPK models
Pure-python binary fixed-point arithmetic library
UART communications with data flow monitoring
Simple API for JADE-based Simulations
Web-based editor for the Gateway Description Language (GDL).
Visu@lGrid - IDE for Building BOINC Projects
PetriNetExec a library for embedding Petri Nets into Java applications