url shortener

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http://yourls.org/

YOURLS: Your Own URL Shortener

YOURLS is a small set of PHP scripts that will allow you to run your own URL shortening service ( a la TinyURL). You can make it private or public, you can pick custom keyword URLs, it comes with its own API. You will love it. There's a WordPress plugin available for YOURLS, making integration with your blog a snap: create short URLs and tweet them automagically as you publish blog posts. Your (short) domain URL, no trailing slash, lowercase. If you pick the non-www version of your domain, don't use the www version in your browser (and vice-versa)
http://tantek.pbworks.com/w/page/21743973/Whistle

Whistle - personal URL shortener

Note: if you're looking for an open source, database-based, generic (any) URL shortener, see other projects like ur1.ca (note: that's U R ONE dot C A ), yourls.org , etc. feel free to suggest others. Old email systems would wrap text at 80 characters (or a few less) and make it just harder enough to reliably reconstruct or use URLs that many systems adopted a common practice of keeping URLs to 70 characters or less by design. This was fundamentally usability driven.