Xchatazure is a project mainly written in C and OBJECTIVE-C, it's free.
X-Chat Aqua for Mac OS X
XChat Azure is a fork from X-Chat Aqua, the Mac OS X native XChat front-end.
Mac App Store is very useful place to distribute applications for non-geek users. Most of Debian/Ubuntu users do not want to search applications on broad Internet world, if you can access alternative (or even the same) applications on Aptitude. So Mac OS X users got the Mac App Store.
But I should keep Mac App Store guidelines to submit X-Chat Aqua. There were some issues.
Main Reason: Any application on Mac App Store may not use names that include 'Mac', 'OS X', 'Aqua' or any other of Apples trademarks.
There was no way. So I dropped the name. Also, where was several other issues because I didn't want to change X-Chat Aqua developement policy.
It should be annoying job to keep these on X-Chat Aqua.
If you are now using XChat GTK or X-Chat Aqua, and now you want to move to XChat Azure, you should do some work.
Unlike XChat GTK and X-Chat Aqua, XChat Azure do not share the traditional configuration direcotry ~/.xchat2 because of Mac App Store guideline.
So if you want to keep your configuration, you should move it, copy it, or make hard link.
Please visit https://github.com/xchataqua/xchatazure