Jabber

Adium is a popular and, probably, the best instant messaging...

VoxOx...

Trillian is a chat application that tries to integrate most of the major chat networks...

qutIM is free and open-source multiprotocol (ICQ, Jabber, Mail.Ru, IRC, VKontakte) instant messenger...

Tomahawk is a social media player that helps...

Jitsi (previously SIP Communicator) is an audio/video and chat communicator that supports protocols such as SIP, XMPP/Jabber...

Fire is a multi-protocol instant messenger client for Mac OS X...

Proteus...

Portable Adium is the multiprotocol Adium instant messaging client that can connect to AIM, MSN...

Tor Messenger--based on Instantbird, an instant messaging client developed in the Mozilla community...

emesene is a chat program that allows you to connect to different networks like MSN...

Kopete is an instant messenger supporting AIM, ICQ, Windows Live Messenger...

PGPTools is a mobile multiplatform encoder of text messages for your mobile device. With this application...

SAPO Messenger for Mac is a free Jabber/XMPP...

Joom is a collaborative brainstorming tool, similar to a group chat plus topics...

iChatMonitor is an application that warn you when one of your AIM/Jabber/Bonjour contact connects his self...

iChatMonitor show a small window like MSN Messenger...

IronAdium is a sandboxed version of the popuplar IM client for MacOSX. The program supplies...

The CMR Sidekick application helps users easily perform...

iChatOnLogin logs you into your iChat accounts ( AIM/Bonjour/Jabber...