Linktree - Connect your audience to all of your content with just one link.
Shlink - A self-hosted URL shortener
Shorby - Shorby URL Shortener is an online utility that easily shortens all the URLs and automatically creates short links.
Lstu - A nice and open source url shortener. You can use it as service or install it on your own server.
many.link - Add as many links in your Instagram bio as you want
Anonymous URL Shortener - Anonymous URL Shortener, Referer, Anonymizer, Redirection service.