radgh

This simple and lightweight plugin adds a “Hide from search engines” checkbox above the publish box to pages. By 
ticking this box, a meta tag will be placed into the <code><head></code> section of your page specifying that robots should 
not index the page.
By default this only applies to pages. You may extend this functionality to posts or other custom post types with a small bit of code. See the FAQ’s tab for further instructions.

Noindex Pages

Ask search engines not to index individual pages by checking an option in the publish post box.

LionScripts.com

LionScripts’ Site Maintenance & Noindex Nofollow is a very useful Site Maintenance plugin, which provides you space to work on your site, when you don’t want to make it live for the people. Apart from just blocking the rest world, the plugin also adds nofollow noindex to your wordpress site, if opted.
<h4>Plugin Features</h4>
<ul>
<li>Adds No-Index and No-Follow if opted</li>
<li>Change your site’s state into developent mode</li>
<li>Works Without any conflict on your existing plugins and themes</li>
<li>Free 24X7 Support</li>
</ul>
For all kind of support and questions, please visit http://support.lionscripts.com/ and provide detailed explaination of the respective issue.
Software specification are available at: 
http://www.lionscripts.com/product/maintenance-and-noindex-nofollow/

LionScripts: Site Maintenance & Noindex Nofollow Plugin

LionScripts' Site Maintenance & Noindex Nofollow is a very useful Site Maintenance plugin, which provides you space to work on your site, whe …

Noindex Pages vs LionScripts: Site Maintenance & Noindex Nofollow Plugin