There are 40 repositories under messenger topic.
Telegram Desktop messaging app
An elegant messages UI library for iOS
Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots
Elegant Facebook Messenger desktop app
Free and Open Source messaging and emailing app that combines common web applications into one.
A community-driven replacement for JSQMessagesViewController
Open source, native iOS Messenger, with realtime chat conversations (full offline support).
Franz is a free messaging app for services like WhatsApp, Slack, Messenger and many more.
Conversations is an open source XMPP/Jabber client for Android
a free (libre) open source, mobile OS for Ethereum
Reference client for Bitmessage: a P2P encrypted decentralised communication protocol:
Simple user messaging package for Laravel
This is not an official Facebook product, and is not affiliated with, or sponsored or endorsed by, Facebook.
A full featured Live Chat, Support & Marketing platform, alternative to Intercom, Drift, Crisp, etc ...
Experimental Telegram web client with tdlib, webassembly and react js under the hood
Timy - open source mobile app for groups to communicate and organize themselves. Built with flutter.
Messaging APIs for multi-platform
Open-source XMPP client for Android
golang im server
Chat SDK Android - Open Source Mobile Messenger
Open source alternative communication platform
:speech_balloon: A UI framework for building messenger interfaces on iOS
:speech_balloon: A community-driven python bot that aims to be as simple as possible to serve humans with their everyday tasks
Ncurses based XMPP client
👽 Wire for web
Definitely the best way to make Bots on Facebook Messenger with Ruby
Unofficial open source mtproto server written in golang with compatible telegram client.