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, Web-based and iPhone 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.
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.
Prose is a distributed, open-source, and native platform for workplace communication.
The Signal Protocol (formerly known as the TextSecure Protocol) is a non-federated cryptographic protocol that provides end-to-end encryption for voice and instant messaging conversations.
This project won the first prize 🥇 at Telegram Lightweight Client Contest and now is an official Telegram client available to anyone at web.telegram.org/a.
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.
Graph Messenger is an UNOFFICIAL messaging app that uses Telegram's API and add new features like real multi account system, download manager and time line.
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Good Alternative to Conversations (also YMPP client)