zURL is a URL shortener
A simple URL Shortening Module for Kohana 3.1. Although not tested, this module should also work ...
A unified PEAR interface for creating and expanding short URL's.
Simple PHP URL shortener, as used on mths.be
🔗 The de facto standard self hosted URL shortener in PHP
PHP URL Shortening encoder/decoder class.
UrlShortener for MODx Revolution.
CodeIgniter Google URL Shortener API
Shorten Url Tracker