Colloquy

Colloquy is a free IRC, SILC and ICB client for Mac OS X. It is a nice solution for those who want to connect to servers of any of those protocols from a Mac computer.

The application isn't that different than mIRC for Windows. It does look way better than mIRC in my opinion, but the windows that are used serve similar purposes. For example, you can access a Console window that serves the same purpose as the Status window on mIRC.

Colloquy has a nice feature list. It is an open-source project which can be improved via the use of plug-ins. It has support for Apple Scripts, so if you know how to code using that, you can create your own plug-ins. By default, this IRC client is standard and doesn't have any special features. There is support for DCC file transfers which can be resumed. You can add emoticons to your conversations and add IRC friends to your buddy list.

In actual usage, Colloquy hasn't disappointed me. Every time I needed to go on IRC, I have used it and it has worked great. I don't miss mIRC at all when I know I have Colloquy on my Mac.

The application has a very native feel to it and I found it to be stable and customizable.