Algorithus

This plugin allows you to easily control whether search engines are disallowed from accessing the root directory of your WordPress site by modifying the robots.txt file. You can enable or disable this functionality from the “Reading” settings page.

AWP Disallow Root Control

Disallow access to the root directory via robots.txt with an option to enable or disable.

Artem Pilipets

Manage prohibitions meta robots and robots.txt file from the control panel using the commands in the format of robots.txt
PHP script parses commands from the metarobots.txt file and creates relevant tags.
<h4>Currently script supports following commands:</h4>
<ul>
<li>
Disallow: 
name=”robots” content=”noindex, nofollow” 
Blocks content from crawling for the search engine.
</li>
<li>
Index: 
name=”robots” content=”index, nofollow” 
Allows crawling, forbids follow the links.
</li>
<li>
Follow: 
name=”robots” content=”noindex, follow” 
Forbids crawling, allows forbids follow the links.
</li>
<li>
Noarchiv: 
name=”robots” content=”noarchive” 
Do not show a link to the cached copy.
</li>
<li>
Nosnippet: 
name=”robots” content=”nosnippet” 
Do not create a snippet.
</li>
<li>
Noodp: 
name=”robots” content=”noodp” 
Do not use the description from DMOZ for snippet.
</li>
<li>
Notranslate: 
name=”robots” content=”notranslate” 
Do not offer page translation.
</li>
<li>
Noimageindex: 
name=”robots” content=”noimageindex” 
Do not crawl the image on the page.
</li>
</ul>

MetaRobots by SEO-Sign

The easiest way to manage meta robots tag.

AWP Disallow Root Control vs MetaRobots by SEO-Sign