envbot is an advanced modular IRC bot in bash. envbot supports SSL, IPv6, module loading/unloading on the fly, advanced access control and many more features.
ultra-xdcc is a XChat-Plugin that supports the xdcc-protocol. That's not all, it has such nice features like: managing downloads, saving download-list on exit, loading download-list on startup ...
A PHP/mySQL driven IRC bot. Full admin system, including a live web interface and IRC admin access aswell. Advanced statistics system. Dynamic loading system to load addons on the fly without need for a restart, making bot uptimes high and stable.
The Open Source Bot Project, or OSB, is an IRC bot written in C++ whose goal is to be as open and dynamic as possible. It will support dynamic module loading as well as a simple yet powerful scripting language. Even the base bot commands are just modules
Wolfpack is a modular Tcl script system for Eggdrop. It supports dynamic loading, unloading, and configuration of script "modules" via Eggdrop's partyline.
NeoStats is a effort to provide Unique Services to IRC networks. Currently NeoStats has Services like StatServ, and Spam Monitor. Module Loading Support is also supported! and Many different modules are available
NejuChat is a framework for writing xchat scripts in python. It abstracts away the cumbersome xchat interface, and provides some goodies. The current source supports loading modules, (unload might take patches to xchat), and comes with some nifty module