dIRC

dIRC is an easy to learn IRC chat program that enables you to converse with people from around the world. Features including: Spell Checking in multiple languages, Scripting in vbscript, jscript, perl, and python, Connecting to multiple servers simultaneously, Skinnable user interface using HTML/DHTML/java/CSS, File transfers between users, User manager, Many options to customize the behavior of the application, Aliases allow you to create custom commands, Events allow you to respond to remote actions with commands or scripts, An icq type notify list lets you know which of your friends are on IRC, and the window manager organizes all your windows and file transfers by server, MS Agent, support for all standard IRC commands, and the source code is publicly available!