davide.airaghi

This plugin allows any user having at least one of the following capabilities to edit robots.txt: 
– edit_files (standard WP capability) 
– manage_options (standard WP capability) 
– unfiltered_upload (standard WP capability) 
– upload_files (standard WP capability) 
– wpseo_manage_options (Yoast SEO capability) 
– aioseo_general_settings (All In One SEO capability) 
– aioseo_tools_settings (All In One SEO capability) 
– aioseo_feature_manager_settings (All In One SEO capability) 
– aioseo_local_seo_settings (All In One SEO capability)
The “Robots.txt” option is added under “Settings” menu.

Robots.txt Quick Editor

Processby

The plugin allows you to create and edit the robots.txt file on your site.
<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).

Robots.txt Quick Editor vs Robots.txt Editor