NIP-28. Amethyst had them built in and then there's also nostrchat.io and nostrchat.com and I believe Coracle used to have this built in, but no one used it so it was removed.
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nos-haiku is still the best 🇯🇵 
Nos Haiku
Oh. I don't recall seeing this one. Thanks.
In Amethyst you have the "Chats" tab and the "Communities" tab.
0xChat does another type of public chat that Amethyst doesn't.
FOMO
Oh shit finally found it!! Nice!