FlightGear is a simulation game released in 2017 designed and developed by FlightGear team. FlightGear can be described as a open source game and can be played on the following operating systems: Windows, Mac OSX.
“The goal of the FlightGear project is to create a sophisticated and open flight simulator framework for use in research or academic environments, pilot training, as an industry engineering tool, for DIY-ers to pursue their favorite interesting flight simulation idea, and last but certainly not least as a fun, realistic, and challenging desktop flight simulator. We are developing a sophisticated, open simulation framework that can be expanded and improved upon by anyone interested in contributing.” - FlightGear team
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