MegaIRC – Portable IRC Client
MegaIRC is an Internet Relay Chat (IRC) Client that can be used portably, Portable IRC. It allows a user to connect to any IRC network and chat with people around the world. MegaIRC contains the basic essentials of a standard IRC client. The color scheme is fully customizable, you can change the text, background and more. MegaIRC also allows it's users to associate sounds with specific events.
MegaIRC Portable IRC Screenshot
Download: Get it HERE