Donncha O Caoimh (a11n)

Adds the referrering link from which a commenting user came from to comment notifications.
Note: if you’re using Jetpack Comments the referrer information is lost and unfortunately this plugin won’t work correctly.

Comment Referrers

Adds the referrering link from which a commenting user came from to comment notifications.

Seans0n

WordPress Referrers is a fully automated, self running referral tracking script. 
You set it up once and just let it run, the list is automatically cut after x days, you can block any domains from being included, includes spam protection and other features.
Features: 
 – Automated and self running 
 – URLs are kept for x days 
 – List is constantly updated 
 – Show x referrers on any of your pages 
 – Widgetized for quick adding 
 – Block urls from the list 
 – Change an outgoing URL to a special URL (such as a top list referral id) 
 – Pick titles for your referrers instead of using the domain name 
 – Tracks hits in and hits out
Related Links:
<ul>
<li><a href="http://www.seanbluestone.com/wordpressp-top-referrers" rel="nofollow ugc">Plugin Homepage</a></li>
<li><a href="http://www.seanbluestone.com" rel="nofollow ugc">WordPress Top Referrers Demo</a></li>
</ul>

WordPress Referrers

WordPress Referrers is a fully automated, self running referral tracking script. You set it up once and just let it run, the list is automatically cut …

Comment Referrers vs WordPress Referrers