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What is a good example of an Open Source IRC client for Windows or Linux? If not, something free and extensible will do.

The reason I would like this to be open source is that I wouldn't mind being able to understand how the message formatting is implemented in such a project.

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closed as off topic by Journeyman Geek, wizlog, 8088, slhck Feb 17 '13 at 9:17

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Related: Good Free IRC Client? –  heavyd Aug 31 '10 at 19:40
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5 Answers

up vote 6 down vote accepted

irssi is both free, and open source, and has windows ports.

However, if you're trying to learn the protocol, I suggest reading the specification rather than trying to reverse engineer a complex client.

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Pidgin (multi-protocol), Xchat (dedicated to IRC) and Chatzilla (built on the mozilla framework and available as add-on for firefox. Written in JavaScript and XUL and therefore perhaps more accessible for your purpose) are open source clients that support IRC. You can also check the links below:

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XChat for Linux/anything else other than Windows, AND HexChat (formerly XChat-WDK) for Linux/Windows.

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Throwing WeeChat in the mix also then :) Used to use irssi, but I lost my config files and I didn't want to rewrite everything. Good thing weechat has saner default settings than irssi.

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PircBot is an IRC API for Java.

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Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. –  soandos Jul 23 '12 at 2:21
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