What are some alternatives?
HexChat - HexChat is a fork of XChat with bug fixes and new features.
mIRC - mIRC: Internet Relay Chat client
irssi - Irssi is a terminal based IRC client for UNIX systems.
XChat for Linux - XChat is an IRC chat program for both Linux and Windows.
KVIrc - KVIrc is a free portable IRC client based on the excellent Qt GUI toolkit.
Quassel IRC - Quassel IRC is a modern, cross-platform, distributed IRC client based on the Qt4 framework.