HexChat

hexchat is an irc client based on xchat for linux , but unlike xchat it’s completely free for both windows and unix-like systems.

Free Open Source Windows Linux BSD MacPorts XQuartz Xfce

XChat for Linux

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. .

Free Open Source Windows Linux

mIRC

mIRC is a popular Internet Relay Chat client used by millions of people, and thousands of organizations, to communicate, share, play and work with each other on IRC networks around the world.

Commercial Windows

irssi

Irssi is a terminal based IRC client for UNIX systems. It also supports SILC and ICB protocols via plugins.

Free Open Source Mac OS X Windows Linux BSD Cygwin

Quassel IRC

Quassel IRC is a modern, cross-platform, distributed IRC client based on the Qt4 framework.

Free Open Source Mac OS X Windows Linux Self-Hosted

KVIrc

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.

Free Open Source Mac OS X Windows Linux BSD

Colloquy

Traditionally, chat clients on the Mac have been anything but glamorous. Colloquy is an advanced IRC, SILC & ICB client which aims to fill this void.

Free Open Source Mac OS X

AdiIRC

c#/csharp IRC CLient. AdiIRC stores all its settings in text files, this way you can grab the adiirc folder and put in on a usb device or external harddrive. Take all your settings and servers with you everywhere!

Free Windows Linux Mac Wine

X-Chat 2 for Windows

A freeware build of X-Chat for windows, as opposed to the official 30-day-trial shareware Windows build.

Free Windows

Konversation

Konversation is an easy-to-use IRC client for novices, nut novices and experts can take advantage of its rich featureset.

Free Open Source Linux

Kiwi IRC

A hand-crafted IRC client that you can enjoy. Designed to be used easily and freely. More friendly than other webirc clients giving the general public an easy option to connect to any IRC network.

Free Open Source Web Chrome Self-Hosted

Textual

Textual is the world's most popular application for interacting with Internet Relay Chat (IRC) chatrooms on OS X. Textual includes two elegantly designed light and dark variants of the user interface to match all tastes.

Commercial Mac OS X

IRCCloud

IRCCloud is an IRC client with a future. Stay connected, chat from anywhere, and never miss a message.

Freemium Android iPhone Web

Shout

What is it? Shout is a web IRC client that you host on your own server.

Free Open Source Web Self-Hosted

Mibbit

No Java, no flash. With Mibbit, chatting online is easy, just choose your nickname and press go! No sign-up is required and you can use it from wherever you are with just a web browser.

Free Web

LimeChat

LimeChat is an IRC client for Windows, Mac OS X and iOS.

Free Open Source Mac OS X Windows iPhone iPad

Yaaic

Yaaic (Yet Another Android IRC Client) is a free and open source Internet Relay Chat (IRC) client for Android devices.

Free Open Source Android

AmIRC

Famous IRC client created by Oliver Wagner and Jamie van den Berge for VaporWare. Its look and feel was copied many times and inspired the creation of XChat.

Free AmigaOS MorphOS

HydraIRC

HydraIRC is an open-source IRC client with an attractive and easy to use interface.

Free Open Source Windows

ZeroChat

An IRC-like internet chatroom hosted on ZeroNet, a distributed network. 0rc is a fully distributed website, and messages are shared through peers using the ZeroNet stack.

Free Open Source Windows Linux Web Mac Self-Hosted Python JavaScript ZeroNet