IRC Clients for OS X

Mac users have been using Ircle since before we crawled out on land.

 

Limechat is free and not bad.

 

IRSSI is the gold standard IMO, but if one is looking for a native Mac client Linkinus is hard to beat.

 

Try Textual

 

http://www.sysctl.co.uk/#macirssi doesn't require you to know irssi commands (but you can still use them if you want) . It adds a simple, clean GUI to irssi.

 

Check out Linkinus. I use it and I like it very much. It's not free though.

 

I third Linkinus, though before I bought it I used XChat for quite a while.

 

Migrating from a linux environment i was much familiar with X-Chat
which i was glad to see in the mac app store !
hence use the same
but i will recommend you to go for adium as it is like multi platform chat client + IRC client ...
i use x-chat only caz i am used to it !!!