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ejabberd is a Rock Solid, Massively Scalable, Infinitely Extensible Realtime Server.

MODERN:
Backend integration with REST API and ejabberdctl command-line tool
Mobile libraries for iOS: XMPPFramework
Mobile libraries for Android: Smack, Retrofit
Web library with WebSocket support and fallback to BOSH support: Strophe
Open Source software: GitHub

FAULT-TOLERANT:
Runs in a cluster out of the box
All nodes are active: platform built on top of ejabberd supports fault tolerance mechanisms
Upgradable while it is running: unmatched uptime
No message lost: for each message, the XMPP server checks the status of delivery with an acknowledgment provided by the mobile app
Mobile network disconnections managed at XMPP server level

MASSIVELY SCALABLE:
Massive concurrency: 2 000 000 users on 1 node
Cluster with consistent hashing to get rid of data replication, resulting in more effective approach in internode communications
Memory reduction of the data kept in memory for each connected user
PubSub broadcast optimisation with reduction of internal data transfer in cluster setup

MANAGEABLE:
ejabberd comes with a very powerful command-line tool that allows controlling most of the aspects of the server. Most common operations can be automated to make it a pleasure for admins to work with.

HIGHLY VERSATILE:
ejabberd offers many customization hooks to adapt it easily to various use cases. This makes it the server of choice no matter which area you are working in: mobile messaging, gaming, internet of things, it can do it all.

VERY MODULAR:
ejabberd code is extremely modular and can be extended through a powerful API. Contributors are using the API to provide tens of third-party extensions to ejabberd to enhance and tailor its behavior.