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.
1TinyLink - One Tiny Link allows you to reduce long links from websites such as Facebook, Twitter, YouTube, Linkedin as well as other sites on the internet for free.
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.
Polr - An open source URL shortener. A great non-profit and free alternative to bit.ly, TinyURL, or goo.gl.
Akari Link Shortener - Anime-themed URL shortener.
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.
T2M - T2M URL Shortener is an all-in-one link management platform which focuses on quality of service with easy-to-use interface at affordable price, backed by exceptional customer support.