FreeFlight is a physics-based flight simulator that I am working on, written in modern C++ and OpenGL. FreeFlight allows you to fly over a detailed rendering of Austria, enjoy the scenic Austrian Alps and visit iconic airports such as Innsbruck (INN) and Vienna (VIE). Currently, only the Cessna 172 is available to fly, however additional aircraft flight models can be added via a simple json-based configuration system.
You can download a very early version of the program here. Please let me know what you think!