diomedes irc

provides better scripting and extensibility than the leading IRC clients

PIRCH is an alternative IRC client.

It is an enhancement for the most popular of all IRC clients for Windows, mIRC.

IRClean is a free, compact anti-worm system designed to combat IRC worms

Firewall Terminator - Anonymizer for FTP, Newsgroups, IRC, ICQ, Email POP/IMAP

Dana is a smart and easy to use IRC client for both, expert and newbie users.

Orion is a compact, yet comfortable IRC client.

it's an IN-GAME IRC Client and WLM Client.

Free IRC Client for windows with fully scriptable interface.

psyBNC is a proxy for IRC networks