osgEarth is a scalable terrain rendering toolkit for OpenSceneGraph.
This Quick Start describes how to start a 3D globe with different overlays.
Open a console and start the osgearth viewer:
export OSG_FILE_PATH=/usr/share/osgearth
osgearth_viewer --window 50 50 900 700 /usr/share/osgearth/maps/srtm.earth
You should see a globe with satellite imagery.
In a console, type:
osgviewer /usr/share/osgearth/maps/openstreetmap.earth
Press h for help. See also openscenegraph.org for more help.
To learn more about osgEarth, a starting point is the Documentation page in the Wiki.