FlightGear Flight Simulator: free open-source multiplatform flight sim
turn-based wargame/simulator
Wind Turbine Rotor Design and Simulation
OpenM++: open source microsimulation platform
Multiagent simulator of road traffic in Qt/C++ and OpenStreetMap.
Free Hydraulic Model for Water Systems
Simulated Airline Travel Solution Provider Library
Former home of the Virtual Cell platform (VCell), see http://vcell.org
Physics Game like "The Incredible Machine"
OMNET++ implementation of framework for opportunistic protocols.
Command Centre
Software for data analysis, image processing, simulations, solver.
Visu@lGrid - IDE for Building BOINC Projects