FlightGear – Free, open-source and multi-platform flight simulator

FlightGear Flight Simulator (FlightGear or FGFS for short) is a free, open-source and cross-platform atmospheric and orbital flight simulation tool that was started by David Murr in 1996 and first released in 1997, now developed by FlightGear developers & contributors around the world. If you've ever dreamed of flying a plane, then you'll love FlightGear.