Tagger?
The app that will make quick work of tagging any* (most!) standard and custom object records with important tags, that you can report on!
Technical Description
Tagger is a lightweight Lightning Component that can be placed on Lightning Record Pages to easily add and remove Tags (junction object records) between the current Source Object record and Target Object records. Tagger is completely admin-customizable with no development required, and because the Tags are stored as junction objects, they are easily reportable through standard Salesforce reporting (unlike other common solutions like multi-select picklists or standard Salesforce solutions to tagging).