This plugin can detect information such as country name, web browser and operating system from your commenters and then displays them on your comment section or anywhere you like.
Features:
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Detects and shows commenter?s country flag, web browser and operating system automatically
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Supports many web browsers and operating systems: major desktop browsers, antiquated browsers, blogging software (for trackbacks and pingbacks), text based browsers, various PDAs and cell phones.
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Uses a binay file for IP to country resolution and supports database sources from Webhosting.info – Software77.net
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The returned string can be configed as a template to suite your theme
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<h3>Credits</h3>
Especially thanks to
<ul>
<li>
<a href="http://priyadi.net/" title="Priyadi Iman Nurcahyo" rel="nofollow ugc">Priyadi Iman Nurcahyo</a> for his <a href="http://priyadi.net/archives/2005/03/29/wordpress-browser-detection-plugin/" title="WordPress Browser Detection Plugin" rel="nofollow ugc">WordPress Browser Detection Plugin</a>
</li>
<li>
<a href="http://firestats.cc/" title="Omry Yadan" rel="nofollow ugc">Omry Yadan</a> for his <a href="http://firestats.cc/wiki/EasyIP2Country" title="Easy IP2Country" rel="nofollow ugc">Easy IP2Country </a> plugin
</li>
</ul>

Comment Info Detector

Enables you to detect your commenter's info and show their country flag, web browser, operating system automatically.

Rakesh Raja

This plugin do wonderful thing. For a developer like me its big problem to make website perfect for all browsers and for that I need to detect browser and write specific CSS for that.
This plugin will give you 3 things
[1] Browser Version
[2] Browser Name
[3] Operating System of user!
For example you will see following 3 classes in you body class.
“chrome 37 windows” this way you can use all these 3 classes together or separate!
Please let me know if you find any bug. Help me make this plugin better!
<h3>Arbitrary section</h3>

WPG Detect Browser

This will add CSS classes in default WordPress body class. You can get browser version, OS and name.

Comment Info Detector vs WPG Detect Browser