X-Plane 6 Trivia
X-Plane started as a commercial product for testing and simulating real aircraft during the design phase. The original software was quite expensive and not meant for gaming. This lasted until 2001 (version 6.0), when Xicat Interactive published it as an entertainment product. As mentioned below, the original design tools: Plane-Maker, Part-Maker and World-Maker, are still included.
The CD actually comes with two versions of X-Plane, X-Plane Classic (not 3D accelerated), and X-Plane 5.X, which is OpenGL accelerated.
X-Plane comes with full Parts Maker (to create parts of airplanes), Plane Maker (to make new aircrafts, including helicopters and VTOL planes), and World Maker (full terrain including placements of objects and airports and such).
X-Plane can accept LIVE weather information via RealWeather system, WHILE the program is running! (with third-party utility) Imagine flying across the country and not knowing exactly what weather you'll encounter until you get there!
X-Plane can actually simulate ANY atmospheric condition... including those of Mars, and someone did just that: