Polr - An open source URL shortener. A great non-profit and free alternative to bit.ly, TinyURL, or goo.gl.
Bitly - Get the most out of your social and online marketing efforts. Own, understand and activate your best audience through the power of the link with Bitly Enterprise.
Shorte.st - Smart and easy way to get extra income from your traffic.
Lstu - A nice and open source url shortener. You can use it as service or install it on your own server.
REEL UNLIMITED - Unlimited design subscription for startups
Shlink - A self-hosted URL shortener