Simon Wheatley

This plugin removes the author names from the feeds in your site, replacing them with the title of the site. There are no options or settings screens.
Plugin development is run on the <a href="https://github.com/cftp/anonymise-feed" rel="nofollow ugc">Github repository</a>.

Anonymise Feeds

For occasions where you don't want to name a post author in the RSS feeds.

Hansdeboeck

You can use this plugin to prevent your site from appearing in the server logs of referred pages as a referrer. The operators of the referred pages cannot see where their visitors come from any more.
For example, this plugin will automatically convert all external links to this format http://cube.hacemedia.be/url/?http://example.com.
This is an anonymous link to example.com which prevents the original site from appearing as a referrer in the log files of the referred page.
Information:
Reliability Hide the referrer from linked sites ? the ?Referer? header will always be blank.
Speed No waiting pages ? no slowdown.
No Ads Links are free of advertisements.
Security All traffic is encrypted using SSL.
(Based on the WP Blank Referer by blackhatzen)

Anonymize Cube

Anonymize all your external links with the Cube service.

Anonymise Feeds vs Anonymize Cube