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Psi is a leading instant messaging / real-time communications client for the Jabber network (using the XMPP protocol). It is cross platform, available for Windows, Mac OS X and X11 (Linux, BSD, Solaris etc.) platforms. It uses the Qt library.
It
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aims to be (and is famous for being) standards compliant and stable. It is also at the cutting edge of XMPP development, with several of the authors very actively involved in the XMPP standards extension process. [Less]
Tkabber is a client for the Jabber instant messaging system. It's writen in Tcl/Tk, and works on many platforms (tested on Linux, FreeBSD, NetBSD, Solaris, MacOS X and Windows 98/2000/XP).
CJC is a Jabber/XMPP client for text terminals. It uses pyxmpp library for XMPP comunication and curses for screen output. It is not fully-featured yet, but still quite usable. Its user interface is resembling those of popular IRC clients like irssi or BitchX.
Galaxium is an instant messenger application designed for the GNOME desktop. It will allow you to connect to MSN (and other protocols through the use of addins) to communicate with your family, friends and co-workers! It is a cross-platform
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application that uses the Mono and GTK# toolkits for the user interface and protocol handlers. Several plugins are also in the works to bring advanced features like Adium Theme support. [Less]
GOIM (Gamers Own Instant Messenger) is a full featured jabber / XMPP client with special features (extensions) for gamers. (e.g. broadcasting a notification when you join a server, or seeing which games others play and joining them with one click on the game icon beside their name).
modification of Bombus, midp mobile jabber client
agsXMPP is a SDK for the eXtensible Messaging and Presence Protocol (XMPP) protocol written in managed C# dedicated to .NET and Mono technologies. The SDK is released as open source under a dual license.
XMPP.NET is an XMPP library written in C# and is designed to be extendable as the protocol itself.
MiniIM is messaging client for jabber/xmpp protocol.
Pandion is an open source instant messenger. Designed to be secure, easy and fun to use. Pandion is also compliant with the open standard XMPP (aka Jabber).
CampusTalkPocket is a GPL'ed Jabber Client for the Windows Mobile PocketPC Plattform. It is based on AG Software's XMPP SDK agsXMPP.