Pidgin is an instant messaging program which lets you log in to accounts on multiple chat networks simultaneously. It runs on Windows, Linux, and other UNIX operating systems. Pidgin is compatible with the following chat networks out of the box: AIM, ICQ, Google Talk, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, MXit, Novell GroupWise Messenger, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr. 

Pidgin - The Universal Chat Client

ejabberd is a distributed, fault-tolerant technology that allows the creation of large-scale instant messaging applications. The server can reliably support thousands of simultaneous users on a single node and has been designed to provide exceptional standards of fault tolerance. As an open source technology, based on industry-standards, ejabberd can be used to build bespoke solutions very cost effectively.

ejabberd - Robust, Scalable and Extensible XMPP Server

ChatSecure is a instant messaging client for iOS and Android that integrates encrypted OTR ("Off the Record") messaging support from the libotr library and the XMPPFramework to handle Jabber/GTalk (XMPP).

ChatSecure - Encrypted chat client for iOS and Android

Apache Vysper aims to be a modular, full featured XMPP (Jabber) server. Vysper is implemented in Java. There are already some larger XEPs as modules available, most notably Multi User Chat (XEP0045), Publish/Subscribe (XEP0060) and    BOSH (XEP0124, XEP0206)


Apache Vysper - A modular, full featured XMPP (Jabber) server

Prosody is a modern XMPP communication server. It aims to be easy to set up and configure, and efficient with system resources. Additionally, for developers it aims to be easy to extend and give a flexible system on which to rapidly develop added functionality, or prototype new protocols.

Prosody - Modern XMPP communication server

Profanity is a console based XMPP client written in C using ncurses and libstrophe, It supports XMPP chat services, including GoogleTalk and Facebook, Chat rooms and private messaging, Roster management and lot more.

Profanity - Console Based XMPP Client

Adium is a instant messaging application for Mac OS X that can connect to AIM, XMPP (Jabber), ICQ, IRC, Bonjour and more. It supports Encryption, File transfer, Tabbed chat windows and lot more.

Adium - Instant Messaging for Mac

Conversations is the instant messaging client for the Android. It supports XMPP, Jabber client, Encryption. It supports to send and receive images as well as other kind of files, Pictures / Avatars for your Contacts, Syncs with desktop client, Share your location, Send voice messages, Multiple accounts / unified inbox and lot more.


Conversation - Instant Messaging for Android

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