WordPress Plugin: The Referraliser
This is an admin plugin called The Referraliser. It shows the referrals to your site and allows you to show them in different ways – the top 10 referrals, what people like searching for to visit your site, etc. etc.
It is integrated with Spam Karma If it is present. It uses the blacklist table data to check for spammer referrer URLs and does not list them if they match.