RoxIRC is a graphical IRC client written in tcl/tk.  It provides a pleasant,
easy to use, and powerful interface.

the features include:
ircII style /commands, with history
configurable colors for information types
dedicated query windows
dynamic configuration, no need to restart it
notify list
all tcl scripting
nicklist, see who is in the channel without /names
dialogs for banlist, modes, kick/ban, etc
popup menus when you right click on nicks, channels, querys...
auto reconnect to server/rejoin channels when disconnected
URL catcher
Supports bold and underlined text
Netsplit detection
DCC chat and file transfers