Psi is a multi platform client currently available for Windows, Linux and Mac. It mimics the looks of Licq.

Client designed for usability, standards compliance and security, including automatic connection encryption, custom emoticons, avatars and text markup.

A robust and premiere GNOME Jabber client. Written in C++ using GTK+, Gnome and the Jabberoo C++ Jabber client library.

Multi-protocol IM client with Jabber, VoIP, digital whiteboard and file transfer support.

A client with whiteboard communication. Windows, Mac and Unix/Linux support.

Client plug-in for Mozilla, written with XUL and Javascript languages.

Small console client for Linux that includes SSL support, history logging, commands completion and external action triggers.

A client that is developed as a successor to winjab, it aims to be a end user client with a smaller interface.

A Windows CE client for the Jabber instant messaging system.

Open source ajax-based jabber web client entirely written in Javascript. Includes screenshots and an online demonstration.