Ariana

<p>This is a very simple plugin that adds a “robots” meta tag to the head of your site with “noarchive” in it.</p>
<p>The effect of the noarchive robots meta tag is that search engines will not keep a cached version of your pages and posts.</p>


Simple Noarchive

Processby

<p>The plugin allows you to create and edit the robots.txt file on your site.</p>
<h4>Features</h4>
<ul>
<li>Works with multisite network on Subdomains;</li>
<li>An example of the correct file for WordPress;</li>
<li>Works out of the box;</li>
<li>Totally Free.</li>
</ul>


Robots.txt Editor

Lightweight and perfect for multisite installations.

But in documentation need to say where the option/editor is installed (Settings > Read options).

Simple Noarchive vs Robots.txt Editor