Nested commands, easy configuration, and an incredibly flexible and easy-to-use plugin system distinguish Supybot from other IRC bots. There simply isn't a more flexible or easier to use IRC bot!
Supybot Twitter plugin, using OAuth. Requires oauth2 & simplejson
As of March 2013, Twitter will be removing API 1.0 and supytweet will likely cease to work.
For an up to date twitter plugin see ProgVal's Twitter on his github; https://github.com/ProgVal/Supybot-Plugins
Muffinbot is an IRC bot that makes having a bot easy. Muffinbot is simple to install, run, configure, and make work for your purposes. The source and plugins are written in PHP. Muffinbot is configured through either the web or the command line.
AppSignal starts at $23/month with all features included. No overages, no hidden fees. 30-day free trial.
Tired of monitoring tools that punish you for scaling? AppSignal offers transparent, predictable pricing with every feature unlocked on every plan. Track errors, monitor performance, detect anomalies, and manage logs across Ruby, Python, Node.js, and more. Trusted by developers since 2012 with free dev-to-dev support. No credit card required to start your 30-day trial.
TwiggiBot can generate stadistics, stores channel logs,coordinates/perfoms a trivial and other many utilities. TwiggiBot can save quite a lot of manual work or can collaborate in several tasks, in short, it could be termed "a butler".
NXscript is a collection of scripts in Python for the popular IRC client on
Linux, XChat.
The scripts offers some features not found in XChat by default. These features
are to make communicating with your friends on IRC easier and more comfortable.