Exact Links - The Most Sophisticated URL Shortener AndConversion Tracking
Shorten.REST - A URL shortener API you can depend on
Rebrandly - Rebrandly is the easiest way to create, share and manage branded links.
PixelMe - URL shortener for savvy marketers
Fast URL Shortener - Simple and fast tool to create a shortened URL making it easy to remember and share.
Pixela - Record and Track your habits or effort. All by API.