PBot is a versatile IRC Bot written in Perl for the ##C channel on Freenode.net

Features
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* Factoids with history logging and ability to undo/redo previous revisions
* Quotegrabs with ability to grab multiple messages from any point in chat history as one grab entry
* Loadable modules that are simple programs based on stdin and stdout
* Lots of default modules, including a code compiler and debugger, C-to-English translator, C precedence analyzer, trivia and much more
* Optional plugins
* Channel management
* User hostmask and message tracking
* Ban evasion detection
* Flood detection
* Enter-abuse detection
* Auto-away detection
* Auto-rejoin after kick detection
* Registry-based customization
* Advanced factoid-based variable interpolation
* Command piping and substitution
* Much, much more

See http://www.iso-9899.info/wiki/Candide for more information.