Freeware/Reference

From Lunarsoft Wiki

Converber - recommended - Converber is a unit converter. It is a powerful software utility that will help make easy conversions between 1173 various units of measure in 32 categories. Converber converts everything from length and force to flow and temperature. See some of the features listed below.

Google Earth - Google Earth combines the power of Google Search with satellite imagery, maps, terrain and 3D buildings to put the world's geographic information at your fingertips.

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. Virtually visit any place in the world. Look across the Andes, into the Grand Canyon, over the Alps, or along the African Sahara.