AthenaIRC was the first mainstream client to port to MacOS X. At it's peak AthenaIRC had over 4,000 regular users in OSX alone. In 2002 it won the REALbasic Cubies award for best internet application. TUCOWS.com gave it four stars. It began a revolution in Macintosh IRC, paving the way for new clients such as xChat and iRC. Clients which give you the kitchen counter, but exclude the sink.
Sadly, AthenaIRC eventually met the same fate as the clients it was created to rival. Constant patches to the code to add new features led to a bulk level that could not be worked with. It's like taking a house, and deciding you want to add a window, but you don't want to rebuild the wall, so you just cut a hole in it. Sure, it works, but the wall will never be as strong as it once was. Now do that over and over again, eventually that wall will be so unstable that you can't work with it any longer. AthenaIRC is that wall, and so it is time to rebuild it.
AthenaIRC 2.1 will be the final version of the AthenaIRC legacy. It's replacement, Minerva, is a MacOS X only rewrite of the AthenaIRC code. Numerous elements of the client have been reworked from the ground up. Parts of the client which served nothing but bloat have been entirely removed.
AthenaIRC still has several thousand loyal users. I have kept this page up here for them, so that if someone would still choose to do so, they can use it.