Bot::basicbot::pluggable started as yet another infobot replacement, but now is a generalized framework for writing infobot-type bots that lets you keep each specific function separate. you can have separate modules for factoid tracking, 'seen' status, karma, googling, etc. included default modules are:

auth - user authentication and main access.
dns - host lookup (e.g. nslookup and dns).
google - search google for things.
infobot - handles infobot-style factoids.
join - joins and leaves channels.
karma - tracks the popularity of things.
loader - loads and unloads modules as bot commands.
seen - tells you when people were last seen.
title - gets the title of urls mentioned in channel.
vars - changes module variables.