WeirdIRC is a widely portable IRC-Client implemented in ANSI Common Lisp and using CLIM (Common Lisp Interface Manager) as GUI Toolkit.
X-Chat plugin to allow Common Lisp scripting.
A flexible and extendable Internet Relay Chat bot written in Common Lisp. Currently developed using SBCL, but known to work in Lispworks and patched CMUCL (see readme notes)
We have moved to http://sv.gnu.org/projects/erc. ERC is a powerful, modular, and extensible IRC client for Emacs and XEmacs. Full documentation can be found on the wiki by following the "Home Page" link.