Patryk

The plugin adds a “noindex” field in the edit window for pages, posts and custom post types (CPT), which, when selected – after saving, adds the “noindex” tag to a given page. The tag blocks the indexing of a given page in search engines, e.g. Google.

PRyC WP: Add noindex tag

The plugin adds a "noindex" field in the edit window for pages, posts and custom post types (CPT), which, when selected - after saving, adds …

Badi Jones

Duplicate Content Cure is an extremely simple plugin that makes WordPress more Search Engine 
friendly (And therefore improving SEO). It does this by preventing search engine spiders/bots 
from accessing pages like Archives, Tags, and Categories, which tend to contain duplicated content 
from elsewhere on your site. This is achieved by adding nofollow, noindex to 
these problem pages.
Duplicate Content Cure doesn’t have a lot of features that other SEO plugins have, but 
it also is lightning fast by comparison.

Duplicate Content Cure

Duplicate content cure is a simple plugin that improves SEO by preventing search engines from indexing pages that contain duplicate content.

PRyC WP: Add noindex tag vs Duplicate Content Cure