Greg Miller
This is the hobby passion, serious flight simulation.  It's based on the X-Plane world which competes with the legacy FSX/FSN Micosoft world. The "battle" is joined, and although FS is no longer supported, it's users far out number "X-Planners", although more are moving platforms. The discussion is XP's aerodynamic model vs. FS's table lookup model. XP is from Laminar Research who is a highly respected aeronautical design firm. It's commercial version is loggable FAA simulation time. The commercial and hobby versions are the same functionally. 

Links: X-Plane.com, X-Plane.org

I'm in the process of a long overdue re-design of my old website.  Some of the legacy content is still visited, please GOOGLE Millerweb.com and you will get an index.  Eventually, I will change it and link to the legacy site.     More....