While searching for the best alternative to Google Earth I bumped into
MARBLE, a KDE educational project. It is a 3D Atlas and Virtual Globe application that rivals Google Earth.
Available Platforms
Windows
Mac
Linux
Follow satellites and space stations and display their orbits
PLANETS
Earth ( and Moon too)
Mars
Venus
Find the distance between places and calculate pedestrian, bike and motorcar routes with ease in both online and offline modes.
* 11 MB of Offline data Available
Views Available
Topological
Satellite
Precipitation
Temperature
Streemap (via openstreetmap)
opencycle (for cylists)
Historical
We can change the times to get different day and nigh view of earth.
Historical View
Saving Map data
We can export or print the current map
Wiki Tags
By clicking the Wiki tags on the marked places, we can view the Wikipedia information.