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A Facebook plugin for Pidgin. Lets you send and receive messages using the Facebook Chat protocol from your favourite instant messenger.
XChat is a fully-featured graphical IRC client using the GTK toolkit. It can be compiled to use GNOME and Perl scripting.
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 ... [More]
Jitsi (previously SIP Communicator) is a cross-platform VOIP, videoconference, desktop sharing and chat client. Protocols supported include SIP, XMPP/Google Talk/Jabber/Facebook chat, AIM/ICQ, Windows Live, Yahoo! Messenger and Bonjour. Other features include: Call recording, Call & chat ... [More]
emesene is a platform independent instant messaging client for the Windows Live Messenger (tm) network. emesene is distributed free of charge under the GNU General Public License 2 or any later version. emesene most interesting features are: * Clean and easy to use Interface? with no ... [More]
X-Chat Aqua is X-Chat with an Aqua interface for MacOS X. X-Chat Aqua uses the irc engine from X-Chat, and is designed to look and feel like the GTK+ front end.
Coccinella is a free and open-source cross-platform communication tool with a built-in whiteboard for improved collaboration with other people.
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).