The SeaMonkey project is a community effort to develop an all-in-one Internet application suite. It contains an Internet browser, email and newsgroup client with an included Web feed reader, HTML editor, IRC chat, and Web development tools, and is sure to appeal to advanced users, Web developers, and corporate users. It uses much of the Mozilla source code powering such successful siblings as Firefox, Thunderbird, Camino, Sunbird, and Miro.
NetPlug is an extensible multi-connections, multi-protocol, network client program, written in pure Tcl/Tk. Includes a complete Irc client plug in that you should love if you like IrcII 'classic' look & feel (plus customizable style/colors scheme, sound,... Now includes full DCC support (with GUI), ircII like aliases and improved scripting (Tcl!), keywords (your nick...) highlighting, and more
tiBot is an automated IRC connection, known as bot, intended to help channel ops manage their channels. There are already alot of other bots out there, but none had all I wanted in a bot, so i decided to build my own. It's currently not usable, but will have several new features in the future. Check the webpage for more information.
Potbot is a simple IRC bot, designed to allow someone with only little Perl knowledge to add modules and produce a custom bot to serve their needs to the greatest extent possible. Although the bot is written to allow easy additions of modules, it's already fully working in its current state and can be used as such without any modification.