It is battle tested, standardized, widely used, have open source servers and apps, end-to-end encryption (OMEMO), self-hostable and are low on ressources and federated / decentralized.
I use it with family and friends. Conversations and blabber.im on android and Gajim on Linux. There’s also apps for windows and Apple.
Curious if anyone here use it and why, why not?
EDIT: Doh. In these Lemmy times I forgot federated. Added.
How does this compare with matrix?
https://www.rst.software/blog/xmpp-vs-matrix-vs-mqtt-which-instant-messaging-protocol-is-best-for-your-chat-application
TL;DR: Matrix is good for text AND binary data (XMPP is text only) but XMPP is a bit more centralized than matrix, though both work based on federation principles. XMPP is more lightweight but supports more config options.
The real core difference is that XMPP just passes messages around (and history is just bolted on as an extra thingy between you and your server), while Matrix is literally a federated database of message history.