This particular app genre - organising one's collections of DVDs CDs, and so on -  is specialist, yet also universally applicable. Specialist, in that almost no one uses this type of application in the real world, yet universal in that almost anyone could. If they were organised enough. I'm not, yet I can see the benefits, as screen-shotted below in this particularly beautifully programmed utility.

From the minimalist Store description:

With the brand new Small Media Manager Reloaded you can store informations about your movies, games, music, books, parlor games, software and wishes. This is just a simple app to keep an overview of all your stuff. Fast and easy.

Here's Small Media Manager Reloaded UWP in action:

A nice touch - the opening 'home' page also includes a random pick from your collections, to inspire you go watch/listen/use....

Each type of collectable is colour coded - and then the title bar of the application changes to this colour as needed, always giving a visual clue of which category you're 'in'. Very nicely done. Here you can see that some of the esoteric collectables - 'Parlor games', anyone? 'Wishes' is, presumably, for anything you want to collect and - although not shown here - items within 'Wishes' have an extra menu function: 'Adopt and remove', i.e. add this to your collection (saving typing) and then remove from 'Wishes'. Perfect.

Entering a new item, just enter a title, tap the appropriate icon, then add optional rating and any notes. All attractively thought out and presented.

The main list for one of the categories ('Movies'), with alphabetic spacers (I've only put in a handful so far), and icons, notes and ratings all showing through. Tap an entry to bring it back up for 'Change' or 'Delete' it, etc.

It seems that there was an old WP8.1 application and you can even import data from this, in the 'Options' menu. Or export your current data to OneDrive, for re-import to Small Media Manager Reloaded UWP on any other Windows 10 device.

You'll have noticed a 'Lent to' field in the original item form - this is for noting which things you lent to which friends, the usual cause of things 'going missing'. Here I'm demonstrating the search facility as well - the sole match here also highlights in red that the item has been lent out - and who to!

You can filter everything by star rating, though note that these aren't minimums. So searching for four star movies only gets you those, not those of four or five. Still, again, it all works. (Despite the small but ironic typo on 'Type'!)

You can grab this here in the Store. In theory, there's a 79p in-app-purchase, but I'm not sure where it is or what it might deliver. Anyway, if asked, I'd pay up - this is very well implemented indeed.