http://biblemeowimkh3utujmhm6oh2oeb3ubjw2lpgeq3lahrfr2l6ev6zgyd.onion/content/bible/communication-methods/jabberxmpp/index.html
It was originally named Jabber, a name which sometimes still gets used for it. Following this guide you will be able to send end-to-end encrypted messages in real time for free. OMEMO OMEMO is an extension to the Extensible Messaging and Presence Protocol (XMPP) for multi-client end-to-end encryption developed by Andreas Straub.