n3k4

To help your WordPress installation be more optimized for search engines, this plugin will include a ‘noindex’ meta tag in the header of any duplicate posts. 
Robots will not index any posts with matching title tags, which is a known indicator of negative SEO. This is very useful for automated posting and working with a large amount of posts.

Noindex Duplicate Posts

This plugin will automatically add a 'Noindex' meta tag to posts that are a duplicate determined by the slug and preexisting post names.

Ivan Kristianto

Easily add Noindex and Nofollow to post, page, search and category page.
See my article <a href="http://goo.gl/500FU" rel="nofollow ugc">Easy Noindex and Nofollow WordPress Plugin</a> for details.
Full list of features:
<ul>
<li>Add nofollow and noindex in post, page, search and category page.</li>
</ul>
Other interesting stuff:
<ul>
<li>Check out the my other WordPress plugins or web development <a href="http://goo.gl/OHQNc" rel="nofollow ugc">My Portfolio</a></li>
<li>Want to optimize your WordPress blog? Check out the <a href="http://goo.gl/QedtH" rel="nofollow ugc">WordPress Optimization Article</a> Guide!</li>
</ul>

Easy Noindex And Nofollow

Easily add Noindex and Nofollow to post, page, search and category page.

Noindex Duplicate Posts vs Easy Noindex And Nofollow