XMPP

Extensible Messaging and Presence Protocol (abbreviation XMPP, originally named Jabber) is an open communication protocol designed for instant messaging (IM), presence information, and contact list maintenance.

Clients

https://dino.im
https://github.com/dino/dino
https://github.com/conversejs/converse-desktop
https://gajim.org

Links

• https://xmpp.org
• https://providers.xmpp.net -- providers
• https://search.jabber.network -- some channels
• https://xmpp.net -- discontinued
• https://wikipedia.org/wiki/XMPP