Maintainer: Lindsay F. Marshall
IRC Channel: None ?
Written in Tcl/Tk, uses the native network communications of Tcl.
Maintainer: Szymon Stefanek
IRC Channel: #KVIrc on freenode
Also written with the Qt toolkit, KVIrc is a beast. Supports DCC Voice, built-in scripting language, and plugins.
Maintainer: Peter Zelezny
IRC Channel: #Linux on ChatJunkies - http://www.chatjunkies.org/servers.php
Using GTK+ and optionally GNOME, supports Perl and Python scripting.