XMPP is described as 'Or Extensible Messaging and Presence Protocol, is an open standard for instant messaging and real-time communication, allowing for message exchanges between any two entities on the Internet. It's known for its decentralized and extensible nature' and is a instant messenger in the social & communications category. There are more than 25 alternatives to XMPP for a variety of platforms, including Android, Mac, Windows, iPhone and Web-based apps. The best XMPP alternative is Matrix, which is both free and Open Source. Other great apps like XMPP are WhatsApp, Jami, Conversations and Adium.
Kaidan is a simple, user-friendly Jabber/XMPP client providing a modern user interface using Kirigami and QtQuick. The back-end of Kaidan is written in C++ using the QXmpp XMPP client library and Qt 5.
nospeak is a decentralized Nostr chat client for secure, private messaging. It is easy to use but has state of the art end-to-end encryption without metadata leakage.
Prose is a distributed, open-source, and native platform for workplace communication.
Chat on the Jabber network (XMPP protocol); focus on features for gateway users The Cheogram Android app allows you to join a worldwide communication network.
monocles chat is a fork of blabber.im and Conversations with some changes, to improve usability.
WhatsApp Chat plugin for WordPress adds a customizable floating chat bubble, WooCommerce and shortcode buttons, Gutenberg block, and Elementor widget.
jami-commander (jc for short) is a simple but convenient CLI-based Jami client app for setting up accounts and swarms as well as sending.
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Good Alternative to Conversations (also YMPP client)