Favored Freeware: Conversation

Conversation makes chatting on the IRC network as easy as using iChat and other IM clients. Conversation allows you to chat in channels and with your friends in a simple, elegant and Mac-like interface without the use of any text commands, and it has a comprehensive set of features, some unique to Conversation.

Pros: Conversation is simple, intuitive, and easy to use. I generally don’t like to use IRC, but when I have to, this application pulls it off nicely.

Cons: Conversation is slightly unstable, but you won’t lose anything during a crash with this app.