Short.io - Short.io makes short links (vanity urls) on your own domain. Free signup, analytics and API. Chrome, slack, zapier and segment integrations.
Linktree - Connect your audience to all of your content with just one link.
Pixela - Record and Track your habits or effort. All by API.
Lnk.Bio - Life's a link
Shorten.REST - A URL shortener API you can depend on
many.link - Add as many links in your Instagram bio as you want