PICSimLab is a realtime emulator for PIC, Arduino, STM32, ESP32, ...
Measurement and Automation Framework + Tool
Fancy interactive fluid simulation for gfx fans, VJs and demo coders
Controller-Pilot Data Link Simulator for procedural and radar training
Equation of stock trading simplified to game of moving resizing balls
Plotter for Control-Systems (Root-Locus, Step-Response, Bode)
a realtime graphics library