This is, essentially, a Dock replacer on steroids - dating back to before the Dock even existed.
I've been using DragThing since v1.0 in the mid 1990's so it's fair to say I'm rather used to it & will be sad to see it finally die after macOS 10.15. The author has announced it will receive no further updates & it is no longer available to purchase.
I'm hunting for anything vaguely similar - essentially a replacement for the Dock or the even more cumbersome Lauchpad, which I cannot bear [literally 10 screens of apps just apparently scattered in at random, whether I want them there or not].
From the DragThing site, showing various display options -
My own, very minimalist way I use it -
Each of these tiny labels can be anchored anywhere on screen, follow you to any Space, be hidden in apps you don't want it to interfere with & when clicked, each one pops open to reveal a completely customisable set of tabs which can contain almost anything - folders, apps, docs, pictures etc
Right click has options & key commands can be added to any item to launch, hide, get info, reveal original etc.
As I now discover I don't have a Mac in the house that will be able to run Catalina, the point has become moot.
Late Late edit
As I now have a new M1 iMac on order I shall be forced to address this very soon :\
If anyone knows Apple Silicon/Big Sur compatible apps, the info would be most welcome.