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.
Denora is a set of Stats Services for IRC networks that allows IRC network admins to get a complete and comprehensive overview of their IRC network. Denora exports this information to MySQL, HTML XML and flatfile databases.
VooDoo cIRCle is modular IRC bot, scriptable thanks to PHP and Perl, with built-in SSL support, File System, private BotNet and advanced security rights for each user. Runs on POSIX/Unices, Windows and Mac OS X.
IRCd server for VolimNet chat network based on Unreal
libslIRC is an easy to use, message loop based IRC library written in and written for C++. While being modular and allowing for easy extension, modules for many important tasks are delivered with the library.