Short.io - Short.io makes short links (vanity urls) on your own domain. Free signup, analytics and API. Chrome, slack, zapier and segment integrations.
PixelMe - URL shortener for savvy marketers
MergeURL - Shorten URLs for free without user registration.
chl.li URL shortener - A simple, modern, free and privacy-friendly URL shortener.
Pixela - Record and Track your habits or effort. All by API.
MailTumble - MailTumble is a service that tokenises email addresses, allowing you to share your lists with third parties.