Bitchbot is a GPL'ed perl-based IRC bot that I coded mainly for #gloom on irc.edgeirc.net. The bot has a wide variety of useful and useless features, to name a few:
* factoids (bits of information about things) * Game server query support for all popular FPS titles (using qstat, www.qstat.org) * Message system for leaving short notes for people who are offline. * Configurable access list to allow users to manipulate certain features. * Channel operator commands (limited use; bitchbot wasn't designed to be a chanbot) * Last seen nickname to find out when a user was last on the channel. * Vote and poll on user defined topics. * Channel statistics (if your server can handle the horrible memory leaks) * Support for the cyborgizer and techifier toys from www.brunching.com. * A ton of other stuff you'll find from looking at the command reference.