The bot currently supports various link shorteners. Currently the list includes: is.gd and v.gd There are plans to add various more link shorteners/other features like custom prefixes or moderation features in the future. You can also selfhost this bot for use in your servers by following the instructions on the bots Github page.
Upvote Link Shortener
Link Shortener is a open source Discord Bot which you can use to shorten links
Check out the home page for the full Discord Bot List.