Marble is an open source KDE Education Project program similar to NASA World Wind or Google Earth. Besides choosing any number of maps to view on your globe (including OpenStreetMaps), you are encouraged to include a KDE Marble widget in your application.
Website: http://edu.kde.org/marble/
Licence: GNU Lesser General Public License (LGPL) version 2.1
Software Version: 1.3.4
Supported Platforms: GNU/Linux, Mac OSX, MS Windows
API Interfaces: Qt designer, C++, Python, D-BUS, Shell script