Arbor is an experimental chat protocol that models a conversation as a tree of messages instead of an ordered list. This means that the conversation can organically diverge into several conversations without the messages appearing interleaved.
You can get information about the Arbor project here
This repo houses the various specifications related to the Arbor chat protocol.
Right now this is only the basic protocol specification, but in the future we expect it to also contain client-side protocol extension specifications and recommendations for implementing clients and servers.