Irssi-scripts is a project mainly written in Perl, it's free.
irssi client scripts
gistlog run /lastlog with given arguments and posts as a new public gist on GitHub
local-growl send growl alerts from Irssi via growlnotify irssi.png is an image suitable for the notification image
growlnotify.pl pretend to be Extras/growlnotify from the growl distribution by forking (for non blocking) then sshing to a remote host and envoking growlnotify there
probably not very useful to others, especially without heavy editing