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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</ul>
<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.

Gourav RR

This plugin do best role to detect browser/platform. For wordpress developer its been complicated to detect browser/platform, this plugin will add browser/platform name as class in body tag of webpage, so as a developer you can easily detect browser/platform and write some CSS or JS stuff according to your requirements.
The plugin will do the following
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Browser
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Web server
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Device
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Operating system
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</ol>
For example, if you are using ipad, then this plugin will add ipad, osx, and safari classes in body tag.
<h3>Additional enhancements in version 2.0.0</h3>
<ol>
<li>
Detected browsers 
‣ Chrome 
‣ Safari 
‣ Netscape 
‣ Opera 
‣ Opera Mini 
‣ Opera Mobi 
‣ Mac Internet Explorer 
‣ Windows Internet Explorer 
‣ FireFox 
‣ Internet Explorer 
‣ Microsoft Edge Browser 
‣ Lynx Browser
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Detected Web servers 
‣ Apache HTTP Server 
‣ Microsoft IIS 7 
‣ Microsoft IIS 
‣ Nginx Web Server
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Detected Devices 
‣ iPad 
‣ iPod 
‣ iPhone 
‣ Android 
‣ Silk 
‣ Kindle 
‣ BlackBerry 
‣ Mobile
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<li>
Detected Operating systems 
‣ Windows 10 
‣ Windows 8.1 
‣ Windows 8 
‣ Windows 7 
‣ Windows Vista 
‣ Windows XP 
‣ Windows 2000 
‣ Windows ME 
‣ Windows 98 
‣ Windows 95 
‣ Windows 3.11 
‣ Mac OS 10 
‣ Mac OS 9 
‣ Linux 
‣ Ubuntu 
‣ Mobile Web OS
</li>
</ol>
<h3>Arbitrary section</h3>

WP Browser/Platform Detection

For wordpress developer its been complicated to detect browser/platform, this plugin will add browser/platform name as class in body tag of webpage, so as a developer you can easily detect browser/platform and write some CSS or JS stuff according to your requirements.

Enjoy guys... :)

Detect Device Plugin, build for Developers

This plugin will append CSS classes in default WordPress body class. You can get browser name, Operating System and actual device name.

Comment Info Detector vs WP Browser/Platform Detection