Bot Sentry is a Pidgin (libpurple) plugin to prevent Instant Message (IM) spam. It allows you to ignore IMs unless the sender is in your Buddy List, the sender is in your Allow List, or the sender correctly answers a question you have predefined.
The IRC's Talking Robot
[ Please read https://sourceforge.net/p/darkbot/news/2014/01/darkbots-revitalization/ ] Darkbot is a portable IRC chat robot written in the C language that can be taught responses to user inquiries, and even have conversations with them. Darkbot was originally created by Jason Hamilton as an aid for help channels on Intenet Relay Chat.
Erwin is an IRC-bot in Perl, using POE.
Erwin is an IRC-bot in Perl, using POE, written with modularity and expandability in mind. Installing and configuring modules is very easy, compared to lots of other Perl bots where you have to read the source and add your own code in the various event loops. Adding additional functionality is as easy as writing a subroutine that returns something and configuring a regex to use that subroutine. By typing "!google keyword", for instance, "Google::Search" gets "keyword" as an argument, searches Google with that keyword and returns a couple of URLs. Further expandability can be achieved using "plug-ins". Plug-ins subclass "Erwin::Plugin", and can recieve and take control over various events. For example does the pastebin-plugin need the ability to take control over every line sent privately by some user, and e.g. a quiz module would need to get every single message sent to a channel while a quiz is going on.
IRCu2.10.11 with some modifications and new cool feutures + Services
This is an IRC bot, providing the same features as the Undernet Channel Service bot, X. It supports username registrations, and channel registrations, and the other commands that the Undernet Channel Service provides.