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.
Perlbot is an IRC bot written in Perl. It depends on Net::IRC and its goals are simplicity and modularity. The base bot allows auto-opping, notes, multiple channels, etc., but much much more is possible through the use of plugins. Many plugins are included, and it should be easy for anyone with some knowledge of Perl to write her own.
SplitFire is a very complete IRC script for EPIC4. It features tab-completion of Nicknames, Channels and Notify list. Configuration and Auto-OP lists are menu-based. SplitFire also contains configurable statusbar colors and several color schemes. Script is also a DICT dictionary client and can access altavista's babelfish.
OperBot is an IRC bot that provides /ctcp INVITE, /ctcp OP, and KNOCK access to a set of oper-only channels. These commands allow an IRC operator to be invited into a channel and become opped in a channel without the bot's administrator managing a userlist. This code is based off the idea of 'son' and 'dth' on EFnet. This code is a standalone C program, and not a script for another client. The code is primarily geared towards "EFnet" IRC daemons, but it works on others.