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