Microsoft Flight Simulator X

Microsoft Flight Simulator X screenshots

Flight Simulator X is the tenth and current version of the flight simulator.
Microsoft Flight Simulator X 8.0 : Incredible perspective

Alternative downloads

Vehicle Simulator
It is an aero-nautical simulator with excellent flight and marine dynamics.
Plantraco FMS Model Installer
FMS (Flying Model Simulator) is an excellent Flight Simulator.
Flight Environment X
It provides nearly unlimited environments for you to fly in.