The FlightGear Flight Simulator project is a free, open-source, multi-platform, flight simulator. FlightGear has been used for desktop simulation, engineering simulations, faa certified simulators, university research, and the aerospace industry.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.