PICSimLab is a realtime emulator for PIC, Arduino, STM32, ESP32, ...
Joystick mapping for OSX
Graphical out-of-order CPU simulator
MIT's spacecraft simulator for control algorithm development
pic 18f452 trainer and internals viewer
A library that allows programs for a NI CRIO to be run on a computer.
Protocl forge is a protocol simulator
Create your own cockpit for flying in FlightGear and other simulators.
A cycle-accurate interconnection network simulator.