OpenPetLocator is a free implementation of a pet search engine tool to allow shelters to publish their animals to a central site and allow potential owners to find by proximity. Similar to PetFinder
It’s currently used to power FindMeAPet.com
(2022 - the site did not work out and I sold the domain in 2008 for the price of a few beers to an Australian guy. The site is now used for selling kittens and puppies from breeders, which I am absolutely horrified by).
Features automatic signup emails, FTP interface/indexing tool and a fully internationalised PHP frontend.
Requires PHP, Apache, MySQL, ImageMagick (and optionally, Python and FTPD)