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
Onis is a script that converts IRC logfiles into an HTML statistics page. It provides information about daily channel usage, user activity, and channel trivia. It provides a configurable customization and supports Dancer, dircproxy, eggdrop, irssi, mIRC, and XChat logs. Persistent data (history files) and automatic log purging make onis applicable for a large number of logfiles. It also features a powerful translation infrastructure.
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.
Praya is a window to all your messages. It ships with many protocols, including DICT, IRC, gale, Maildir, a timer, and Yahoo! Pager. Praya is easily extendible. Adding new protocols is relatively straightforward. It has a modular architecture which makes it easy to write bots, gateways, spam filters, etc.