trivial-irc
trivial-irc is a small IRC library that provides only very basic facilities for communicating with IRC servers, and has no facilities for extensions like DCC, CTCP etc. Look at cl-irc for that.

https://github.com/karvus/trivial-irc//

ASDF-install package (obsolete) http://trivial-irc.googlecode.com/files/trivial-irc-0.0.2.tar.gz