1.Kissa.be: Kissabe supports four kinds of  inputs, like email, url, text, image. It’s also php based script with easy installation and easy controlling capacity.

Kissa.be

Download.   Demo.

2. PHPurl: PHPurl is PHPurl is a simple script that allows users to make a shorter url. You can get all installation information in Readme added to the zip file available for download.

PHPurl

Download. Demo.

3.TightURL: TightUrl is also a php based script. It’s very powerful against spam. It checks various databases before adding as short url.

TightURL

Download. Demo.

4. Yourls: It’s one of the best URL Shortener script. It can be used for different purpose, like public, private, or even with wordpress as a plugin!

Yourls

Download. WordPress Plugin.

5. Shorty: It’s also one of the bests. It’s a mixture of php and MySQL scripting.  It’s admin interface makes it more valuable.

Shorty

Download. Demo.

If you are using Google Apps , you can get your own url shortener service for you own use only. See this post.

You can read a full tutorial on Making your own Url shortener at howgeek.tk.