MapTools

This software makes computation of aerial distance, driving distance, and total geographic area of any number of points a breeze. The code is 100% javascript, with configuration settings in an XML file. A single PHP file is also used.

FlashMaps

Flash Maps is an applet that lets you enter a location and compare the imagery from Google Maps, Yahoo Maps, Windows Live Local, NASA, and more. The applet uses Flash, and includes 100% of the Flash source code with purchase (the free version does not include Flash sources)

Distance Table Computer

Given two tables of addresses – sources and destinations – this software creates a pivot table-like display of all distances & driving times. Requires only a server with PHP – no database necessary.