Marble

About

Marble is an open source KDE Education Project program similar to NASA World Wind or Google Earth.

Homepage

http://edu.kde.org/marble 

License

GNU Lesser General Public License (LGPL) version 2

Documentation

Getting Started 

•  Click on the desktop icon
•  If you have used Google Earth before you should be able to figure this one out without much difficulty.
•  In the Settings menu select full-screen mode
•  Explore ...
•  In the bottom-left corner of the program window there is a subtle tab called "Map View". Click on it.
•  Select another map (e.g. 'Precipitation (July)')
•  Explore some more ...

See the Marble homepage for more help.