ejabberd is a robust, scalable open-source realtime messaging platform supporting XMPP server, MQTT broker, and SIP service, designed for developers and teams building high-performance communication, IoT, and VoIP applications.

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🚀 Overview

ejabberd is an open-source, Erlang/OTP-based realtime platform that provides a rock-solid XMPP server, MQTT broker, and SIP service. It's renowned for its massive scalability, fault tolerance, and extensibility, capable of handling millions of concurrent users.

What problem does this project solve? It addresses the challenges of building reliable, high-scale realtime communication systems that support multiple protocols without downtime or data loss, especially for mobile messaging, gaming, and IoT.

Who is it built for? Developers, sysadmins, and teams deploying production-grade servers for chat apps, IoT platforms, and VoIP services.

Why did you build it? Developed by Process-One over 16+ years to deliver a professional, standards-compliant implementation of open realtime protocols like XMPP, MQTT, and SIP.

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✨ Key Features

• Multi-protocol support for XMPP, MQTT, and SIP (powers chat, IoT pub/sub, and VoIP in one server)
• Massive scalability: 2M+ concurrent users on a single node, efficient clustering with consistent hashing
• Fault-tolerant: Hot-upgradable, no message loss, handles mobile disconnections
• Highly extensible: Powerful APIs (REST, ejabberdctl), modular hooks for custom plugins
• Manageable and secure: Command-line tools, SSL/TLS, interoperable with clients and federates

Optional: Built-in PubSub, WebSocket support, mobile libraries integration

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🛠 Tech Stack

• Backend: Erlang/OTP
• Database: Mnesia (default Erlang DB), PostgreSQL, MySQL, SQLite, Redis, Riak
• Auth: Modular authentication (internal, external LDAP, JWT, etc.)
• Hosting: Self-hosted, Docker containers, OS packages (Debian/Ubuntu), Homebrew

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👥 Who Is This For?

This project is useful for:

• Developers who want to deploy scalable XMPP/MQTT/SIP servers for apps
• Teams looking for fault-tolerant realtime infrastructure
• Indie makers building chat, gaming, or IoT prototypes

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📸 Screenshots / Demo

• Live demo: N/A (server software, deploy your own)
• GitHub: https://github.com/processone/ejabberd
• Docs & Videos: https://docs.ejabberd.im/

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🔥 Project Status

• 🟢 Actively building

Last updated: 2026-03-23

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❓ FAQ

Is this project free?

Yes — Open Source (Commercial support available from Process-One.)

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Is the source code available?

Yes — https://github.com/processone/ejabberd

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Can I contribute?

Yes — Open GitHub Issues for bugs/features, submit PRs following CONTRIBUTING.md, translations via Weblate, join community chat at xmpp:ejabberd@conference.process-one.net.

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📬 Contact & Links

• Website: https://www.ejabberd.im/
• GitHub: https://github.com/processone/ejabberd
• Twitter/X: N/A
• Email: security@process-one.net (security issues)

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