MapSphere is a manageable way to view and organize geographical data of different kind. This might be raster maps and satellite imagery from various sources, your own information received from GPS, tracks of your friends, whatever you want.
NASA World Wind Alternatives
NASA World Wind is described as 'World Wind lets you zoom from satellite altitude into any place on Earth. Leveraging Landsat satellite imagery and Shuttle Radar Topography Mission data, World Wind lets you experience Earth terrain in visually rich 3D, just as if you were really there' and is a Map service in the travel & location category. There are more than 10 alternatives to NASA World Wind for a variety of platforms, including Windows, Web-based, Android, iPhone and Android Tablet apps. The best NASA World Wind alternative is Google Earth. It's not free, so if you're looking for a free alternative, you could try Google Earth or Zoom Earth. Other great apps like NASA World Wind are TerraExplorer, Earth View from Google Earth, Sentinel Hub and SAS.Planet.
Alternatives list
A browser-based virtual planetarium of stars and planets customizable by location (latitude and longitude) and time of day.
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