Microsoft Flight Simulator is described as 'Immerses you in a beautifully rich and realistic world with dozens of aircraft and interactive Missions for a completely new and innovative gaming experience. Free Flight lets you fly anywhere in the world, from your hometown airport to the most exotic' and is a flight simulator in the games category. There are more than 10 games similar to Microsoft Flight Simulator for a variety of platforms, including Windows, Android, iPhone, iPad and Linux apps. The best Microsoft Flight Simulator alternative is FlightGear, which is both free and Open Source. Other Microsoft Flight Simulator like games are Rigs of Rods, X-Plane, Aviassembly and Prepar3D.
Reentry is a space flight simulator based on real life spacecrafts. You create a new astronaut, gain levels and experience for every move you make by completing missions in space.
Take Off – The Flight Simulator offers fun and exciting missions in an open world, several highly detailed planes, challenging weather conditions, astonishing views in a free flight mode and the possibility to create and manage your own airline.
Plane Simulator 3D 2016 offers you the most realistic flying experience with 3D graphics and animations where you act as an pilot of the game!.
Flight Simulator Freeware downloads for MSFS, FSX, FS2004 to FS98, Prepar3D and X-Plane. Freeware Software plus all the latest flight sim news.
This is more an extensions for flight simulators than a flight simulator in its own right.
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Kerbal space program is better imoo