FlightGear Flight Simulator: free open-source multiplatform flight sim
SUMO is a microscopic, multi-modal traffic simulation.
System dynamics program with additional features for economics
Object-oriented equation-based modelling and optimisation software
Plug&Play Hardware simulation over a virtual bus system.
IDE for modeling and simulating discrete systems
Discrete System Modeler
Random phenomena generator
Gradually Varied Flow (GVF) simulation.
Building blocks for the renewable energy industry.
Agent-based simulation toolkit
Utility to show live progress, status & stats for running simulations
A multi-modeling and simulation environment to study complex systems
RetroPC-SIM is an Arduino project to help to understand how pc works