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Extensible Messaging and Presence Protocol (XMPP) is an open XML technology for real-time communication, which powers a wide range of applications including instant messaging, presence and collaboration.

XMPP is federated, which means that multiple XMPP servers can talk with each other. A user on 404.city can easily talk to someone on skyn3t.in. If you want to talk to someone on 404.city you don't need to create another account on it.


All of these clients have E2EE[1] available by default, or by plugins. The most widely used is OMEMO[2]


A cross-platform desktop client for XMPP; built using Python and GTK.


An Android XMPP client.


"Profanity is a console based XMPP client written in C using ncurses and libstrophe, inspired by Irssi"