X-Plane is a commercial flight simulator app with editions for consumers as well as professional flight training & certifications. The vendor claims this app is “ultra-realistic” and “The world’s most advanced flight simulator”.
Developed on the Mac, for the Mac, and for Microsoft Windows and Linux.
Download a free demo version, which includes gliders such as Schleicher ASK 21. And download the manual.
This demo is nearly identical to the full version of X-Plane 10 Global—it has the same aircraft, with the same world-class flight model and beautifully realistic rendering technology—but it only comes with scenery for the Seattle area (instead of the whole world), and it will ignore joystick input after 15 minutes.
This free demo includes:
- over 40 aircraft, including general aviation planes, airliners, gliders, helicopters, and fighters,
- the ability to shoot IFR and VFR approaches with ATC guidance, and
- immersive scenery for Seattle-Tacoma International Airport and the surrounding area.
See Wikipedia page for some technical details about how this product works.