FlightGear Flight Simulator: free open-source multiplatform flight sim
System dynamics program with additional features for economics
The Open Source CFD Toolbox
Class library for computational cybernetics
PySCeS Constraint Based Modelling
Cellular Automata library for SUPercomputers (CASUP)
A multi-modeling and simulation environment to study complex systems
Acoustic Simulation Library for Frequency and Time Domain Simulations.
Managing Ongoing RElationships for Agent-Based Modelling
LBM3fm - Lattice Boltzmann method for film flow modelling
A simple approach to modelling images provided by BTA 6-m telescope
Modelling environment for environmental modelling
A Library for Interactive Modelling and Visualisation
Lightweight Architecture for boundedly Rational Agents