ArcGIS Explorer

ArcGIS Explorer is a free downloadable application that offers an easy way to access online GIS content and capabilities. With ArcGIS Explorer, you can connect to a variety of free, ready-to-use datasets hosted by ESRI. Combine these with your own local data or other 2D and 3D Web services to create custom maps and perform spatial analysis.

Google Earth

Google Earth lets you fly anywhere on Earth to view satellite imagery, maps, terrain, 3D buildings and even explore galaxies in the Sky. You can explore rich geographical content, save your toured places and share with others.

Gaia - The Carbon Project

Gaia is a free Windows application used for accessing, visualizing and sharing location content. Gaia 3 lets you seamlessly access and use a vast array of location content and services from your Windows desktop – including Microsoft Virtual Earth, Yahoo! Maps, Google Earth KML/KMZ, OGC GML, ESRI Shapefiles, OGC WMS, WFS, WCS services and more

Bing Maps

Bing Maps is an integrated set of services that provides quality geospatial data, rich imagery, cutting-edge technology, and dependable performance that helps organizations visualize data and provide immersive end-user experiences.  

NASA World Wind

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.