In-memory message queue with an Amazon SQS-compatible interface
The first messaging platform operating without user identifiers
Saves Discord chat logs to a file
Telegram Desktop messaging app
Distributed instant messaging system for developers
Desktop Telegram client with good customization and Ghost mode.
A reference implementation of the SimpleX Messaging Protocol
Modern XMPP ("Jabber") Chat Client using GTK/Vala
LXMF client for Android, Linux and macOS to communicate with people
Private messenger for Windows, Mac, and Linux
WhatsApp library for NodeJS that connects through the browser app
A multi-channel SMS sending wheel
A free (libre) open source, mobile OS for Ethereum
You can message and share files inside your intranet without a server.
Secure communication software
Development toolkit for Web Services and XML data bindings for C & C++
Become a 10x Instagrammer and Escape Brainrot with Instagram CLI
Desktop chat client for Google Hangouts
Terminal client for Cabal, the p2p chat platform
Flash message middleware for Koa and Passport
Redis Simple Message Queue
A Node client for the Facebook Messenger Platform
Create chat bots for Facebook Messenger, Slack, Amazon Alexa, etc.
Flash message middleware for Connect and Express