Maintainer: Lindsay F. Marshall (<Lindsay.Marshall @ ncl.ac.uk>)
IRC Channel: None ?
Written in Tcl/Tk, uses the native network communications of Tcl.
Maintainer: Szymon Stefanek (<stefanek @ tin.it>)
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 (<zed @ linux.com>)
IRC Channel: #Linux on ChatJunkies
Using GTK+ and optionally GNOME, supports Perl and Python scripting.