I have already read that Hare possible will never have package manager.
But I have question -- how\where to find hare packages?

I tried to look them here on sr.ht some gui libs. But or I wrong using
search here, or there is no any libs. And should I look them at github
etc?

GUI libs only as example.

There's a collection of them here:

https://sr.ht/~vladh/hare-project-library/