Desktop client for Facebook Messenger
WhatsApp library for NodeJS that connects through the browser app
A free and open source instant messaging and VoIP platform
Desktop Telegram client with good customization and Ghost mode.
Franz is a free messaging app for services like WhatsApp, Slack, etc,
Telegram Desktop messaging app
A New Kind of Instant Messaging
Saves Discord chat logs to a file
Elegant Facebook Messenger desktop app
The first messaging platform operating without user identifiers
LXMF client for Android, Linux and macOS to communicate with people
Private messenger for Windows, Mac, and Linux
A Decentralized, Onion Routed, Private Messenger
Open source machine learning framework to automate text conversations
Bluetooth mesh chat, IRC vibes
In-memory message queue with an Amazon SQS-compatible interface
A Tox-based instant messaging and video chat client
Telegraph is a Laravel package for fluently interacting with Telegram
Home to the Signal Protocol and other cryptographic primitives
A free (libre) open source, mobile OS for Ethereum
Distributed instant messaging system for developers
Python chatbot framework with Natural Language Understanding
A reference implementation of the SimpleX Messaging Protocol
A universal instant messaging (IM) program
PHP & MySQL based CMS with messenger