AdFly is one of the oldest high-paying URL shorteners that not only has a really good reputation but a track record of paying its link shrinkers (users) on time and a great place for advertisers to spend their marketing budget.
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.
Moourl - Moourl will let you shorten the massively long and complex URLs that you obtain from YouTube or other sites.
Polr - An open source URL shortener. A great non-profit and free alternative to bit.ly, TinyURL, or goo.gl.
YOURLS - YOURLS is a website that contains all the tools you need to create and launch your very own URL shortener. URL shorteners like bitly or TinyURL are fine for public use, but they offer limited options in terms of URL customization.
Snipurl - Snipurl is an online medium to get transform the ugly and log URLs with the short and tiny URLs in order to share them properly and keep the message effective one.
Shorte.st - Smart and easy way to get extra income from your traffic.