An IRC client library built atop irc-conduit. Why another IRC client library, you cry? I didn't really find one that did what I wanted (specifically, handle connecting to servers and calling event handlers, possibly with TLS), but which didn't implement almost a full IRC bot for you. That takes out all the fun!
irc-conduit and irc-ctcp are my solution to the first part of that, this is my solution to the latter. It's a simple IRC client library that does the basics for you, but isn't an all-singing, all-dancing, fully-featured IRC application. It is a merely a simple library.