What are some alternatives?
When comparing Kiwi IRC and irssi, you can also consider the following products
HexChat - HexChat is a fork of XChat with bug fixes and new features.
Pidgin - Pidgin is an easy to use and free chat client used by millions. Connect to AIM, MSN, Yahoo, and more chat networks all at once.
KVIrc - KVIrc is a free portable IRC client based on the excellent Qt GUI toolkit.
WeeChat - WeeChat is a fast, light and extensible chat client.
mIRC - mIRC: Internet Relay Chat client
IRCCloud - IRCCloud is a modern IRC client that keeps you connected, with none of the baggage. Stay synced and notified wherever you are with our web and mobile apps.