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