Rebrandly - Rebrandly is the easiest way to create, share and manage branded links.
Shorten.REST - A URL shortener API you can depend on
PixelMe - URL shortener for savvy marketers
Pixela - Record and Track your habits or effort. All by API.
chl.li URL shortener - A simple, modern, free and privacy-friendly URL shortener.
Zero Width Shortener - Shorten URLs with zero-width characters