AdiIRC is an IRC client with multiserver support and a customizable interface.
Konversation is a user friendly Internet Relay Chat client.
A simple IRC client
A cross-platform (using GNOME/GTK+) IRC client software for advanced users with multiple server support.
IRC plugin for Kopete IM
A Songbird add-on that provides you a clean and easy to use extensible Internet relay chat
A fast and light IRC client for many operating systems.
A public chat server