Irssi is a modular [[IRC]] client for [[UNIX]] that currently has only text mode user interface, but 80-90% of the code isn't text mode specific, so other UIs could be created pretty easily. Also, Irssi isn't really even IRC specific anymore, there's already working [[SILC]] and ICB modules available. Support for other protocols like [[ICQ]] and [[Jabber]] could be created some day too.
* http://irssi.org/?page=about
Nice tips and tricks
*http://irssi.org/?page=docs&doc=tips
also check out <nowiki>#irssi</nowiki> on [[Efnet]]
There's a icon to show off that you're using it [http://unkreativ.org/button-irssi.png here].