Zip locator or store locator software??

[Bill36]

I am looking for zip locator or store locator software that is FREE. I just recently registered ziplocator.us and would like to develop it into a site where you can search zip codes and find stores, gas stations, etc around that zip code. I have found a few online but they are all paid. I would like to find a free software that is somewhat reliable as a test run for the site. If its successful I would like to purchase the software.

Can anyone help me out?