Get mirc 5.71 now! This is the latest version of mirc and provides you with all the nessicary things for immediate chatting. Oh, and it's FREE!!! To download it just click on the image above
Yet another chat program, I have no idea how this one works though.
IRCLE
This is an IRC program for Mac users. It is currently available in an English, French, and a German version.
Leaf Chat works on many Win 95, win98, and Win NT computers. It seems to be a new and modern approach to IRC.