I’ve looked at Casa. It wasn't CasaOS, but now I'm remembering.. I think they supported casa's marketplace conventions.. so that's how as a new project it had a big marketplace as they sort of piggy backed all the apps that casa supported onto their own marketplace.
Have you tried?
https://casaos.io/ https://github.com/casaos
I’ve looked at Casa. It wasn't CasaOS, but now I'm remembering.. I think they supported casa's marketplace conventions.. so that's how as a new project it had a big marketplace as they sort of piggy backed all the apps that casa supported onto their own marketplace.