Fire 1.5 is now available. Fire is a free instant messaging client for Mac OS X that supports AIM, ICQ, irc, Jabber, Google Talk, Apple iChat Server, MSN, Yahoo! Messenger, and Apple Bonjour. Some of the features that Fire includes is Rendezvous chat, Tabbed Chat windows, and styled text chat.
Read more about Fire IM Client for Mac OS X

Or Download Fire 1.5 IM Client for Mac OS X

Do you use instant messenger clients like AIM, ICQ, MSN, Yahoo, Jabber, or Gadu-Gadu? If you do and you use more than one then you need to check out Kopete instant messenger. Kopete instant messenger is a multi-protocol instant messaging client that makes multiple IM easier. It supports AIM, ICQ, MSN, Yahoo, Jabber, IRC, Gadu-Gadu, Novell GroupWise Messenger, .Net Messenger Service, Lotus Sametime, SMS, Skype, and Winpopup. Tools such as message encryption, archiving, and spell check are just some of the great features that Kopete offers to make your instant messaging funner and easier. The Kopete handbook is accessible from the application just in case you need help with any features. Kopete is used for KDE environments. Learn more or Download

Trillian is a free, full-featured, stand-alone, skinnable chat client. Trillian lets chat with users from ICQ, AIM, Yahoo Messenger, MSN, and IRC all from the same program. It acts as a hub for all you chat networks after you import passwords, buddy list, and client preferences. Some features it has is audio chat, file transfers, group chats, chat rooms, buddy icons, typing notification, tabbed chatting and system-tray notifications/alerts. Trillian is easy to install and setup so go and download this free chat client or if you need more information go to the Trillian website. Do you know of any other free chat clients like Trillian? Leave me a comment if you do. I love to find new software and love comments. Thanks