andreu

This plugin automatically adds HTML anchor tags to plain text links and email addresses embedded in the content of posts and pages (WordPress already does this by default for comments).
In the plugin configuration page, you can choose to open the links in a new window or in the current window.

AutoLink

This plugin automatically adds HTML anchor tags to plain text links and email addresses embedded in the content of posts and pages.

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:
<ul>
<li>
Detects and shows commenter?s country flag, web browser and operating system automatically
</li>
<li>
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.
</li>
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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.

AutoLink vs Comment Info Detector