Telegram Desktop messaging app
Desktop Telegram client with good customization and Ghost mode.
WhatsApp library for NodeJS that connects through the browser app
A reference implementation of the SimpleX Messaging Protocol
Desktop client for Facebook Messenger
Modern XMPP ("Jabber") Chat Client using GTK/Vala
LXMF client for Android, Linux and macOS to communicate with people
A Tox-based instant messaging and video chat client
Distributed instant messaging system for developers
A Decentralized, Onion Routed, Private Messenger
In-memory message queue with an Amazon SQS-compatible interface
Home to the Signal Protocol and other cryptographic primitives
Development toolkit for Web Services and XML data bindings for C & C++
A GNU/Linux operating system accessible for visually impaired.
Chat Messenger. E-Mail-Client. Websearch. Filetransfer.
Desktop chat client for Google Hangouts
Terminal client for Cabal, the p2p chat platform
IXSF Messenger is a java-based messenger
A Node client for the Facebook Messenger Platform
Create chat bots for Facebook Messenger, Slack, Amazon Alexa, etc.
Instant Messenger Application
Simple and lightweight IM client