Colloquy is a free, open source IRC client based upon the Firetalk IRC engine for Mac OS X 10.3.9 and later. Its customizable, Cocoa-based interface will feel familiar to users of Apple's iChat, making it quite friendly and approachable for an IRC application. It is also fully compatibe with mIRC coloring, aind includes full DCC support.
Version 2.3 (4617) adds/changes the following:
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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!