GIS or Geographic Information System is a system for information about the terrain of Earth.

These are Free PHP Scripts that will show a geographical map on your site. Very useful when you have to display locations. Visitors can easily see the exact location on your map. Using GIS is the best way to display locations on your website.

Can you imagine a real estate site without maps?

What about a site with Google Maps that visitor can zoom in and out, the map  can be moved, you can place markers to show the exact location on the map and display a balloon with html content when you mouse over the marker.