Adium is an Open source multi-protocol instant messaging client for Mac OS X, supports MSN, Jabber, Yahoo! and other networks.

Bit Chat is a secure, peer-to-peer, open source instant messenger with end-to-end encryption.

Conversations is an open source XMPP/Jabber client for the Android platform.

Digsby provides you with IM, email and Social networks in one easy to use application.

Empathy is an instant messaging (IM) and voice over IP (VoIP) client which supports text, voice, video, file transfers, and inter-application communication ov…

Gajim is an instant messaging client for the XMPP protocol which uses the GTK+ toolkit.

iMessage is an instant messaging service.

Coccinella is a free and open-source cross-platform client for the XMPP/Jabber-instant messaging-protocol.

Dasher Messenger provids a way to message friends.

Disa is your new messaging hub. Conversations from different services can seamlessly be joined together, or disbanded within seconds.

Finch is a console-based IM program that lets you sign on to AIM, Jabber, MSN, Yahoo!, and other IM networks. It runs on Unixes. It uses GLib and ncurses.

Glip is fully searchable, real-time group chat; video chat, task management, file sharing app.