Short.io for Craft gives every entry a short link and keeps it correct without anyone having to think about it. Publish an entry and it gets a link, change the slug and the link repoints itself, unpublish and it stops working. Editors get the short URL, a QR code and click counts in the entry sidebar, without leaving Craft.
It is deliberately small: no new element type and no new field type, just a sidebar panel, a Links screen and a handful of Twig functions. Set UTM defaults once and override them per entry, adopt the links already on your domain with a single command, and check the connection with a built-in doctor before an editor finds the problem for you.