FlightGear 3.2, Learn to fly for (almost) real with this impressive open-source flight simulator
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Introduction to FlightGear
FlightGear is an open-source flight simulator. It supports a variety of popular platforms (Windows, Mac, Linux, etc.) and is developed by skilled volunteers from around the world. Source code for the entire project is available and licensed under the GNU General Public License.
The goal of the FlightGear project is to create a sophisticated and open flight simulator framework for use in research or academic environments, pilot training, as an industry engineering tool, for DIY-ers to pursue their favorite interesting flight simulation idea, and last but certainly not least as a fun, realistic, and challenging desktop flight simulator. We are developing a sophisticated, open simulation framework that can be expanded and improved upon by anyone interested in contributing.
There are many exciting possibilities for an open, free flight sim. We hope that this project will be interesting and useful to many people in many areas.
Download Scenery
FlightGear has a seamless, continuous oblate ellipsoid world available for you to explore. Our terrain is based on 90m SRTM data and is very detailed. There are over 20,000 airports you can visit world wide. You can download 10×10 degree chunks of the world, run a utility called terrasync to fetch scenery as you fly (just in time), or purchase the entire world on a 3 DVD set.
Much more info on the site.