[Forever-Free Friday] Flight Gear (www.flightgear.org)
Flight Gear is a FOSS flight simulator, available for Linux, Windows, MacOS and FreeBSD.
FlightGear - A sophisticated flight simulator (www.flightgear.org)
FlightGear is an open-source flight simulator. It supports a variety of popular platforms (Windows, Mac, Linux, etc.) and is developed by skilled volunteers from around the world. Source code for the entire project is available and licensed under the GNU General Public License....
FlightGear Home (www.flightgear.org)
FlightGear is an open source flight simulator that was built originally as an alternative to Microsoft Flight Simulator. Many would say that FlightGear is the best free flight sim currently available, receiving favorable reviews across major gaming publications.