A circuit simulator with graphical user interface (GUI)
PICSimLab is a realtime emulator for PIC, Arduino, STM32, ESP32, ...
Plug&Play Hardware simulation over a virtual bus system.
Integrated Development Environment (IDE) for learning HDL
RSSceSim - Reputation System Scenario Simulator
Lucid chamber simulator
Allows you to build your own circuits and test them
Live DVD with CORE network simulator
Highly realistic and immersive model for Flightgear.
An open source process simulator
The Future of the Java Circuit Simulator
A free automata simulator that simulates DFA/NFA/DPDA/NPDA/STM
Virtual paper folding program
Simulate high power rocket flights with splash down plots
Ein Simulator für Registermaschinen
Ein Simulator für Turingmaschinen
A full simulator of the WRAMP CPU and REX board.
Robot simulator inspired by Sim.I.Am
An easy way to explore older computers and their OSes using simh