Bluetooth mesh chat, IRC vibes
Elegant Facebook Messenger desktop app
The original full-platform IM communication layer framework
WhatsApp library for NodeJS that connects through the browser app
The official MacOS, Windows, and Linux clients for Pulse SMS
Lghtweight cross-platform instant messaging app
Mixin Messenger desktop app for macOS, iPadOS, Linux, and Windows
Server for forwarding iMessages to clients within the BlueBubbles App
Smoke: Android Crypto Chat Messenger
Flash message middleware for Connect and Express