FlightGear Flight Simulator: free open-source multiplatform flight sim
SUMO is a microscopic, multi-modal traffic simulation.
Physically accurate and validated GPU ray-tracer
Virtual X-Ray Imaging Library on GPU
XFLR5 is an analysis tool for airfoils, wings and planes
Object-oriented equation-based modelling and optimisation software
Open source software calculating industrial noise in the environment
General Mission Analysis Tool
Data Analysis, Simulations and Visualization on the Sphere
A library for scientific data visualization
System dynamics program with additional features for economics
Ab initio simulator for thermal transport and lattice anharmonicity
Fast integrator of stochastic partial differential equations
physics-based multicellular simulator
A code primarily aimed at DNA and RNA coarse-grained simulations
Plug&Play Hardware simulation over a virtual bus system.
A Qt application for water hammer simulation.
A simulation library for discrete event and hybrid dynamic systems.
FEATool Multiphysics is an easy-to-use FEA and CFD Simulation Toolbox
A network server for the flightgear simulator