Solaris

Smack is an Open Source XMPP (Jabber) client library for instant messaging and presence. A pure Java library, it can be embedded into your applications to create anything from a full XMPP client to simple XMPP integrations such as sending notification messages and presence-enabling devices.

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Smack is written in:
Java

Author:
Jive Software

Openfire is the award-winning, open alternative to proprietary instant messaging. It is remarkably simple to install, manage, customize, integrate with other applications, federate with other networks or even use as a platform for your own applications. Openfire is dual-licensed under the Open Source GNU General Public License (GPL) and commercially.

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Available translations:

Openfire is written in:
Java

Author:
Jive Software

Swiss knife of messaging protocols, the psyced implements 3 interserver protocols being PSYC, XMPP and IRC, 5 client protocols (the 3 again plus TELNET and WAP) and some more things like a built-in webserver, SMTP gateway, notification and social networking functions, all of which is only loaded when you need it. psyced provides an API for writing customized chatrooms, which can be entered from any of the protocols. Further XEPs not listed below: XEP-0178: Best Practices for Use of SASL EXTERNAL with Certificates. XEP-0185: Dialback Key Generation and Validation. XEP-0190: Best Practice for Closing Idle Streams. XEP-0212: XMPP Basic Server 2008. XEP-0220: Server Dialback. psyced also implements many functionalities in a PSYC fashion, which is unlike the equivalent XEPs, but may actually work, too. psyced is not focused on being a good Jabber server, but it is a good choice if you want to take part in the "Jabber" experience without actually using "Jabber" software.

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psyced, Server for Decentralized Messaging and Chat over PSYC, IRC, Jabber/XMPP and more is written in:
LPC

Author:
http://about.psyc.eu

Tigase Server is a lightweight and scalable Jabber/XMPP server written in Java. No third party libraries are needed. It can be used as embedded application in other systems or as a standalone service. Low resource consumption makes it a good solution for small installations and scalability makes it also good for deployments with very high load and a huge number of users, it can be installed on as many machines as needed. Very modular and extensible.

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Available translations:

Tigase is written in:
Java

Author:
Artur Hefczyc

Psi is a free instant messaging application designed for the Jabber IM network (including Google Talk). Fast and lightweight, Psi is fully open-source and compatible with Windows, Linux, and Mac OS X. With Psi's full Unicode support and localizations, easy file transfers, customizable iconsets, and many other great features, you'll learn why users around the world are making the switch to free, open instant messaging.

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Average: 4.5 (915 votes)

Author:
The Psi Team