Constant on Nostr: is a client that exists. Did not spend a whole lot of time testing it, appears ...

https://obelisk.ar is a client that exists. Did not spend a whole lot of time testing it, appears focussed on groups/relays.

Liked the promo video though, although i don't know what ''chat without a server'' means.
https://www.youtube.com/watch?v=iFP9qdG4HNU