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

Features

• 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.