Telegram Desktop messaging app
Desktop Telegram client with good customization and Ghost mode.
The first messaging platform operating without user identifiers
Saves Discord chat logs to a file
Private messenger for Windows, Mac, and Linux
Elegant Facebook Messenger desktop app
A free and open source instant messaging and VoIP platform
A Decentralized, Onion Routed, Private Messenger
In-memory message queue with an Amazon SQS-compatible interface
A New Kind of Instant Messaging
Telegraph is a Laravel package for fluently interacting with Telegram
WhatsApp library for NodeJS that connects through the browser app
A Tox-based instant messaging and video chat client
A reference implementation of the SimpleX Messaging Protocol
Desktop client for Facebook Messenger
Home to the Signal Protocol and other cryptographic primitives
A free (libre) open source, mobile OS for Ethereum
Python chatbot framework with Natural Language Understanding
Open source machine learning framework to automate text conversations
Franz is a free messaging app for services like WhatsApp, Slack, etc,
Distributed instant messaging system for developers
A universal instant messaging (IM) program
You can message and share files inside your intranet without a server.
Development toolkit for Web Services and XML data bindings for C & C++
A GNU/Linux operating system accessible for visually impaired.