In 2009, WorldWind was recognized with its most prestigious award, NASA Software of the Year. In addition, James Gosling, the ‘Father of Java’ has said “WorldWind is the gold standard, truly a thing of beauty!”
WorldWind can incorporate any spatial data you like, aerial photography, topographic maps, KML, Collada, GeoTiff, etcetera. Out-of-the-box it comes with NASA and USGS satellite imagery, OpenStreetMap and Microsoft Bing data.
github.com/NASAWorldWind (Code Repository)