Github-adv-search is a project mainly written in PHP, it's free.
Using GitHub's API this will allow one to sort search results & to filter them further
Proof of concept complete, demo http://github.jaoudestudios.com/ Forked from https://github.com/eddiejaoude/Zend-Framework--Doctrine-ORM--PHPUnit--Ant--Jenkins-CI--TDD-
This project plans to extend GitHub's search by giving the user (un-authenticated) additional abilities:
Follow the latest updates of this project on twitter http://twitter.com/eddiejaoude_git
Authenticated users