OK after more digging they are called Progressive Web Apps (PWA’S)

Now that I found proper term I am getting many results.

Thanks for reply. Do those have an .app extension? Where can they be found ?

I stumbled upon a useful website but come to find out its also a web app?!

The domain is .app. So what is cool is I was able to create its own entry in my phones app list by clicking the add to Home Screen button on Firefox.

My question is where can I find a website with lists of these with categories even

I didn’t have much success with search engine queries. Thanks!.