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[321 users on Ohloh]
Unified OS X instant messaging platform
[99 users on Ohloh]
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 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.

[20 users on Ohloh]
Alvaro's Messenger is a Tcl/Tk client for MSN Messenger. Its features include multi-language support, smileys, docking support for KDE 3 and GNOME 2 (FreeDesktop compatibility), logging, profiles support, email notification, customizable sounds, group management, file transfers with NAT support, and proxy support. Some special features include the possibility of knowing who has deleted you from his/her list, connecting "silently" (appearing invisible), and so on.
[19 users on Ohloh]
KVIrc is a free portable IRC client based on the excellent Qt GUI toolkit. KVIrc is being written by Szymon Stefanek and the KVIrc Development Team with the contribution of many IRC addicted developers around the world.
Eclipse Communication Framework
[17 users on Ohloh]
ECF is a framework for building communications functions into Eclipse-based tools and applications. It can be used to create other plugins, tools, or full applications that require asynchronous point-to-point or publish-and-subscribe messaging.

ECF is also a small set of applications for real-time developer communication, including instant messaging, file sharing, and real-time collaboration.

[10 users on Ohloh]
Coccinella is a free and open-source cross-platform communication tool with a built-in whiteboard for improved collaboration with other people.
[7 users on Ohloh]
A Jabber/XMPP library written in Tcl.
[7 users on Ohloh]
Browser-based web conferencing software.

- Presentation and document sharing
- Audio and video sharing
- Application sharing
- White board and annotations
- Chat
- Polls
- Question manager
- Record and archive

Both open-source and enterprise edition available.

Claros inTouch
[3 users on Ohloh]
Claros inTouch is an Ajax communication suite with key features such as webmail, address book, post-it notes, calendar (in progress), built in instant messenger, RSS reader and webdisk(in progress). It is the first open source web application which features built in spam protection and instant messaging capabilities. Claros inTouch can be installed on any platform (i.e Windows, Linux and MacOS X).
[3 users on Ohloh]
Ayttm is an open source, multi-protocol instant messenger. It is built using C and Gtk-2 and works across multiple platforms.
[3 users on Ohloh]
Java Instant Message (IM) Library, Client and Tools.

Flexible framework to design your own IM client or bots. Supports AIM, ICQ, Yahoo, MSN, Jabber, SMS.

Fully functional GUI with spell checking and a lot more. Includes a web interface for remote/cell access.

[3 users on Ohloh]
modification of Bombus, midp mobile jabber client
[2 users on Ohloh]
Net4j Signalling Platform

Net4j is an extensible client-server communications platform based on OSGi but also executable stand alone. You can easily extend the protocol stack with Eclipse plugins that provide new transport or application protocols. Net4j's focus on performance and scalability is featured by non-blocking I/O, zero-copy signals and multiplexed binary protocols. Net4j was originally developed to support the CDO technology for distribute...

[2 users on Ohloh]
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).
[2 users on Ohloh]
This project is now called Ubiety and is being tracked on a different page.
[1 users on Ohloh]
Lightr is an XMPP and BOSH client written in object-oriented PHP5. It is intended to be run on-interval by an AJAX-enabled frontend and utilizes the CURL library to handle connections with a BOSH server.
[1 users on Ohloh]
JMeeting is a next generation type of business or personal meeting. JMeeting will have audio, video and chat conferencing easily set up and viewable. JMeeting will be able to share and create presentations. During the meeting you can click present and it will present the presentation or document full screen to all users with a red laser to show important points.
[1 users on Ohloh]
Tags: social mac communication dpc linux chat client windows osx qt qt4
A Client for the Dark Pragrammers Chat
[1 users on Ohloh]
A implementation of the XMPP protocol written in C# and a WPF client.

Project moved to http://babelim.codeplex.com/

[0 users on Ohloh]
Mia is a Web-based Ajax chat application. It is designed to be simple to setup, easy to use, secure, platform independent, and database platform agnostic.