NASA WorldWind

World Wind is an open-source (released under the NOSA license) virtual globe first developed by NASA in 2003 for use on personal computers and then further developed in concert with the open source community since 2004. World Wind is cross platform  software development kit (SDK) writen in Java aimed at developers. The World Wind Java version was awarded NASA Software of the Year in November 2009.

Currently an HTML5 version of the software is being released, that is going to be adopted as EarthServer globe visualization toolkit.

The program overlays NASA and USGS satellite imagery, aerial photography, topographic maps, Keyhole Markup Language (KML) and Collada files.