Power Map can probably be best described as 'Google Maps for geeks'. The recently released Google Maps API provides access to a large number of mapping features and metadata, but the standard Google Maps site provides only a bare bones interface with minimal functionality. The goal of the Power Map project is to rectify this, and provide a Web based interface to as much of the underlying Google Maps API as possible, as well as adding other neat features, such as distance measurement and movement tracking.
License Free
Operating System Webware