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.
ClixTrac - ClixTrac is a platform that allows users to know how many times the visitors have clicked their ads to services.
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.
LinkTrackr - LinkTrackr helps you track your ad campaigns & affiliate links in real-time.
Polr - An open source URL shortener. A great non-profit and free alternative to bit.ly, TinyURL, or goo.gl.
Linktrack - Linktrack is a platform that allows users to monitor every click, and they can get real-time updates on it so that they can know from where the traffic is coming.
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.