For comparison of simulation and experimental scattering data
CReST: The Cloud Research Simulation Toolkit
A Turing Machine Simulator
A Library for Interactive Modelling and Visualisation
A simple hydrodynamic code less than 700 lines long!
VOpR - a virtual optical rail
Computer science experiment manager
OpenEstragon is a market economy simulator.
collection of illustrative programs:small games, simulators: C, Matlab
FDTD Electomagnetic Wave Simulation Software
Agent-based framework for Artificial Life and Complex Systems