Can anyone recommend a utility that scans your sim & shows add on scenery/airports on a global map? To me this would be very useful! 
Little Navmap (freeware) https://albar965.github.io/
Once you have installed it click here and it will load the airports (only airports, not scenery addons) from the sim and highlight their icon with a yellow outline:
Note that it won’t highlight them unless the author of the addon has changed the airport data, so addons that replace only buildings won’t show up.
Thanks, I have that but as you say it only shows airports, not all either! Looking to see which cities/landmarks I have. Gets complicated when your community folder is >286gb+
Only 288GB? 
This might be useful, I’ve tried it and it does show addon locations, just bear in mind it will take a while to index everything on first run. It’s not perfect, but you might find it useful.
Hello,
I moved your post to Third Party Addons > Tools & Utilities.
I use MSFS Addons Linker. Works great for keeping my Community folder manageable! I’ll give the Addon locator a try! Thanks.
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Its great, thanks!
Consider that if you don’t even know what you have, you probably A. Aren’t using most of them and B. Don’t need them. Otherwise you’d remember.