Are there any other AT protocol apps that aren’t derivatives of bluesky? By that I mean, not social media feed related, twitter clone.

Yep lots! Mine is a livestreaming service: https://stream.place

Also a great blogging platform: https://leaflet.pub

Here's a goal tracker: https://goals.garden

This one just dropped recently; it's 44 different atproto-related apps with a cyberpunk theme: https://www.aetheros.computer/

Lots others mentioned here: https://blueskydirectory.com/

Don’t know if people are building GitHub-like systems, offline-first app sync etc

Many devs reuse schema and write some twitter/bsky clone

Kind of search engine for my Blueaky likes

Gotta get off the timeline, germ has a messaging app, then there is Tangled and some more

We do Fortransky and Cobolsky now, got more ideas for the protocol than time :)

i am currently working on a dropbox alternative: https://dropb.at