Windows Clients
ADIIRC
AdiIRC is a free Internet Relay Chat (IRC) client.
mIRC
mIRC is a popular Internet Relay Chat client used by individuals and organizations to communicate, share, play and work with each other on IRC networks around the world. Serving the Internet community for over two decades, mIRC has evolved into a powerful, reliable and fun piece of technology.
dIRC
With dIRC, you can easily connect to any of the numerous IRC chat networks and talk with millions of users throughout the world.
dIRC includes a modern, fully customizable user interface reminiscent of Office 2000. dIRC can connect to multiple chat servers simultaneously, with channels and private chats conveniently organized in the Window Manager.
dIRC comes packed with many of the same options found in other IRC clients,
HexChat
HexChat is an IRC client based on XChat, but unlike XChat it’s completely free for both Windows and Unix-like systems. Since XChat is open source, it’s perfectly legal. For more info, please read the Shareware background.
SMuxi
Smuxi can be detached. Start a server, and connect to it from any computer, anywhere. Resuming is seamless and changes are updated on all computers, so you can check what was going on while you were away.
Linux/Unix Clients
HexChat
HexChat is an IRC client based on XChat, but unlike XChat it’s completely free for both Windows and Unix-like systems. Since XChat is open source, it’s perfectly legal. For more info, please read the Shareware background.
irssi
Irssi is a modular text mode chat client. It comes with IRC support built in.
KVIRC
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KVIrc is a free portable IRC client based on the excellent Qt GUI toolkit. KVirc is being written by Szymon Stefanek and the KVIrc Development Team with the contribution of many IRC addicted developers around the world.
SMuxi
Smuxi can be detached. Start a server, and connect to it from any computer, anywhere. Resuming is seamless and changes are updated on all computers, so you can check what was going on while you were away.
X-chat
XChat is an IRC chat program for both Linux and Windows. It allows you to join multiple IRC channels (chat rooms) at the same time, talk publicly, private one-on-one conversations etc. Even file transfers are possible.
weechat
Full-featured IRC plugin: multi-servers, proxy support, IPv6, SASL authentication, nicklist, DCC, and many other features..