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 userss to associate sounds with specific events.
MegaIRC Portable IRC Screenshot
Authors Website: http://www.softpedia.com/get/PORTABLE-SOFTWARE/Internet/Chat/Portable-MegaIRC.shtml
Download: Get it HERE