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An IRC-Bot, written in Perl. There are a lot of useful commands for channel management (and other stuff) available per default. Also it's possible to create your own Plugins to extend it's functionality.
Infobot-like behaviour plugin for supybot. This is the Factoids plugin, which can take an infobot's database dump (almost verbatim, very minor scriptable change required) and use it as a factoids store. My own bot uses this, and is the main development erm, guinea pig.