This was originally just made as a school project (in a cource about databases) but later turned into a product I used on the domain http://www.arbr.se (deprecated). It is a DIY URL-shortener built in PHP using Laravel and open for everyone to use. Detailed instructions on how to set it up and how use it might come later.
Here are some views from the website:
A simple first view where you may read about the service and paste your link to get it shortened.
A form where you sign up to start using the service. Built with reCAPTCHA (for security) and Gravatar (for avatars).
The profile-page where users can see, edit, delete etc. their links.
The page where the user signs in.
GNU v.3, see the license.