IRCStep is a relatively mature (it's been under development since 1998) IRC client, originally written for NeXT OpenStep (Steve Jobs' prior effort at a usable Unix), and now ported to OS X (Cocoa). Since it is of Japanese origin, it is also seamlessly capable of working with Japanese (2-byte) Kanji. IRCStep is also compatible with SOCKS5 firewalls. IRCStep is distributed as freeware.
Currently, no user reviews have been submitted. Send me yours!
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Also, if you have an older Mac, be sure to check out the "Classic" applications page for more options.
Finally, take a look at ALEMIA if you think you know that name of an application, but aren't quite sure.
These are applications that are newer and of potential interest, but which I haven't yet selected for permanent inclusion. Have a look, and let me know if you think they deserve to be part of the permanent collection!