Irssi

From Pulsed Media Wiki

Irssi is a very popular IRC console client.

Irssi supports plugins and theming, and is included in many linux distribution's default repositories. Irssi is installed on PMSS by default.

To install irssi in debian or ubuntu simply issue as root: apt-get install irssi

Windows users may prefer mIRC or running irssi under Cygwin.