Looks like HolePunch (tech behind keet.io ) went open source (unnoticed by me).

Would love to see #nostr like app built on it that don't require relays.

CC: nostr:nprofile1qqsrc2zasv9lgvcnttnpcusmw5xwzxh9ktscwufd0gt347numfjfu5qpp4mhxue69uhkummn9ekx7mqpz3mhxue69uhkummnw3ezummcw3ezuer9wc5nmzpg

https://github.com/holepunchto