Zebot is an IRC bot with a completely modular design, POE event driven architecture, multi channel and server support, dynamic internationalization support, and user- definable reactions and emotes along with basic IRC bot functionality including channel camping, rights distribution, user authentication, and a message system.
SurrealServices is a full replacement IRC Services package providing NickServ, ChanServ, BotServ, MemoServ, and OperServ, as well as LogServ and ConnectServ. Features are loosely based on ConferenceRoom/Auspice and Anope, as well as NeoStats. Some security features are also available such as a TOR (http://tor.eff.org/) detector/banner and a country detector (which checks IP allocation and optionally bans). It is multithreaded to eliminate lag due to the asynchronous nature of MySQL and DNS lookups.
Quassel IRC is a modern, cross-platform, distributed IRC client, meaning that one or more clients can attach to and detach from a central core, much like the popular combination of screen and a text-based IRC client, but graphical. In addition to this unique feature, it aims to be a comfortable chatting program.