I'm trying to figure out how to run one right now. I see two main code repos, one in TypeScript and one in Go (signaling a lack of unity among the dev team already). Neither one really tells how to run it or what it does.
https://github.com/bluesky-social/atproto
https://github.com/bluesky-social/indigo
Okay, here's an early "awesome"-style list...Still not much info on what to do: https://github.com/bluesky-social/atproto-ecosystem