Whatsapp like messenger with encryption. Has a GNU/Linux command line client.

All your chats in one app. Yes, really.

• Beeper Bridge Manager @ GitHub.

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• docker-beeper - Beeper Desktop in your web browser! @ GitHub.

An elegant Facebook Messenger desktop app.

Caprine @ GitHub

WhatsApp HTTP API (REST API) that you can configure in a click! 3 engines: WEBJS (browser based), NOWEB (websocket nodejs), GOWS (websocket go).

WhatsApp HTTP API (REST API) that you can install on your own server and run in less than 5 minutes!

• WAHA @ GitHub.

Delta Chat is a decentralized and secure messenger app.

💬 Reliable instant messaging with multi-profile and multi-device support.

• Delta Chat @ GitHub.

he most secure messenger in the world.

a free messaging app for Slack, Facebook Messenger, WhatsApp, Telegram and more.

• Franz @ GitHub.

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• 10 open-source Windows apps I can't live without - and they're all free @ ZDNet.

Batteries included UI to monitor your Messenger workers, transports, schedules, and messages.

An open network for secure, decentralized communication. Matrix is an open source project that publishes the Matrix open standard for secure, decentralised, real-time communication, and its Apache licensed reference implementations.

Related contents:

• Giving Up on Element & Matrix.org @ マリウス.
• La DINUM annonce son soutien à la Fondation Matrix.org pour renforcer l'autonomie numérique de la France et de l’Europe @ DINUM :fr:.
• Building a serverless, post-quantum Matrix homeserver @ Cloudflare.
• Use Protocols, Not Services @ ~~p.
• Episode 146 @ Linux Dev Time.

fast & lightweight self-hosted messenger. A federated messenger for self-hosting.