JSBSim

JSBSim is a multi-platform, general purpose object-oriented Flight Dynamics Model (FDM) written in C++. The FDM is essentially the physics & math model that defines the movement of an aircraft, rocket, etc., under the forces and moments applied to it using the various control mechanisms and from the forces of nature. JSBSim can be run in a standalone batch mode flight simulator (no graphical displays) for testing and study, or integrated with FlightGear or other flight simulator.

Features include:

Fully configurable flight control system, aerodynamics, propulsion, landing gear arrangement, etc. through XML-based text file format. Rotational earth effects on the equations of motion (Coriolis and centrifugal acceleration modeled). The earth atmosphere is modeled according to the International Standard Atmosphere (1976) Configurable data output formats to screen, file, socket, or any combination of those. A Python module which provides the exact same features than the C++ library