FlightGear is a sophisticated, realistic flight-simulator, created entirely by volunteers, and released as free, open-source GPL software, available for download here. It has a graphical user interface realistic enough for real-life pilot training, and mathematical flight models accurate enough for serious scientific research. Its free and open license also makes it great for educational exploration, or just for fun.
It can be expanded and improved by anyone interested in contributing. The complete project source code is available via Git, licensed under the GNU General Public License. Its open architecture encourages the exploration of a wide variety of flight simulator concepts, and has inspired a number of related projects.
Did you ever want to fly a plane yourself, but lacked the money or ability to do so? Are you a real pilot looking to improve your skills without having to take off? Do you want to try some dangerous maneuvers without risking your life? Or do you just want to have fun with a more serious game without any violence? If any of these questions apply to you, PC flight simulators are just for you.
The license of this software is Freeware, you can free download and free use this action game software.