Short.io - Short.io makes short links (vanity urls) on your own domain. Free signup, analytics and API. Chrome, slack, zapier and segment integrations.
Shorten.REST - A URL shortener API you can depend on
BioLinky - Yet another link tool? Yeah.. But better, and totally free!
Pixela - Record and Track your habits or effort. All by API.
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.
chl.li URL shortener - A simple, modern, free and privacy-friendly URL shortener.