[Ritewut]

Tangled is working on something like that. I believe they are federating on the @protocol.

https://tangled.org/

[Zambyte]

I am very active on bsky and I also use some other ATProto applications like tangled. I think this is the first time I have seen anyone refer to ATProto with an '@'

[hooverd]

It's less used but the @ is the atproto logo. I default to saying aye-tee instead of at though. It just sounds better.