xchat_speak is a small Perl script designed to be used with xchat to act as a bridge between it and the Festival Speech Synthesis System. Using it allows you to listen to IRC conversations rather than just reading them. This turns out to be quite useful if you want to get on with something else while IRCing.
XChestival is an improved version of xchat_speak designed for Italian. It lets xchat and irssi "speak" through festival. It comes with a script for xchat and irssi and the Italian phonemes. The scripts have some useful features like channels and query filtering and string substitution.