Note: This is for the C# version of Worldwind. For information on the newer Java-based API please visit https://www.ohloh.net/p/wwj
World Wind, an open source 3D interactive world viewer, was created by NASA's Learning Technologies project, and released in mid-2004. It is now developed by NASA staff and open source community developers.
At its simplest you can think of World Wind as a desk globe, however World Wind is not a simple desk globe.
World Wind allows any user to zoom from outer space into any place on Earth. World Wind uses satellite imagery and elevation data to allow users to experience Earth terrain in visually rich 3D, just as if they were really there.