Qucs-S is a circuit simulation program with Qt-based GUI
FlightGear Flight Simulator: free open-source multiplatform flight sim
Quantum Mechanical Charge Field - Molecular Dynamics
An generic emulation of motor drives.
Circuit simulator for power electronics
PCRaster environmental modeling software
Cellular Automata library for SUPercomputers (CASUP)
Parallel simulators for Membrane Computing on the GPU
An Open source Analysis and SImulation Toolbox for Fuel Cells
A highly flexible 3D flocking boids simulator, conceived as a tool for
Yet Another Finite Element Method Solver
Weighted Implementation of Suboptimal Paths (WISP)
3D model viewer and world navigator.