Conversation

I really like the idea of P2P messengers, but none of them have nailed it just yet. #FOSS #OpenSource

Tox: Good, but it seems to have stalled, and there are no clients for iOS and Mac. They seem to be developing a standard which is key.

Session: Another good one, but only has first party apps, don't developing a standard - rather just apps, and is a little crypto-ey.

Delta Chat: not really P2P but uses a set standard (email), wish there were more choice of inter operable apps.