Jeff Starr

Does one thing: disables WP robots meta tag.
Activate this plugin to disable the robots meta tag (added in WP version 5.7).
Features
<ul>
<li>Lightweight – only one line of code.</li>
<li>Simple to use – activate and done.</li>
<li>No settings to worry about.</li>
<li>Easy peasy.</li>
</ul>
Why is this useful?
Because most existing WordPress sites (i.e., a LOT of sites) already have robots meta tags taken care of, either via plugin or theme enhancements. So when upgrading to WordPress 5.7, there may be conflicting or redundant meta tags, which may not be optimal for SEO. This simple plugin disables the new WP robots meta tag completely, so it will not interfere with existing meta robots configurations. Or maybe you are setting up a new site and don’t want WordPress to add any meta tags to your pages. Whatever the reason, this plugin will do the job with a click.
More infos
For more information about the new WP Robots functionality:
<ul>
<li><a href="https://make.wordpress.org/core/2021/02/19/robots-api-and-max-image-preview-directive-in-wordpress-5-7/" rel="nofollow ugc">New Robots API</a></li>
<li><a href="https://perishablepress.com/wordpress-disable-wp-robots/" rel="nofollow ugc">WordPress Plugin: Disable WP Robots</a></li>
</ul>
Privacy
This plugin does not collect or store any user data. It does not set any cookies, and it does not connect to any third-party locations. Thus, this plugin does not affect user privacy in any way.
Disable WP Robots is developed and maintained by <a href="https://x.com/perishable" rel="nofollow ugc">Jeff Starr</a>, 15-year <a href="https://plugin-planet.com/" rel="nofollow ugc">WordPress developer</a> and <a href="https://books.perishablepress.com/" rel="nofollow ugc">book author</a>.

Disable WP Robots

Activate this plugin to disable the robots meta tag that was added in WP v5.7.

jruizcantero

This plugin add the tag META NOINDEX to attachment pages in WordPress. When it’s inserted some image, or any other multimedia file, into a post/page it can be linked to Attachment Page using <a href="https://codex.wordpress.org/Template_Hierarchy" rel="nofollow ugc">WordPress Theme Hierarchy</a> (attachment.php, image.php …$mimetype.php, etc.) and this plugin will be able to doesn´t index Attachment Pages for improve SEO (Search Engine Optimization). 
The plugin “WordPress SEO by Yoast” and some others plugins let you redirect Attatchment Pages to either post/page, but some times it’s need use Attachment Pages without redirect and without index it inside search engines. (You can find <a href="http://www.ampercent.com/prevent-indexing-wordpress-image-attachment-pages/9082/" rel="nofollow ugc">more info about it here</a> )
So, the plugin “Noindex Attachment Pages” add next tag into HTML head for Attachment Pages;
 
Any suggestions? You can write me or follow me on <a href="http://twitter.com/jruizcantero" rel="nofollow ugc">Twitter @jruizcantero</a>.
<h4>Descripción en Español</h4>
Este plugin añade la etiqueta META NOINDEX a las páginas de adjuntos en WordPress. Cuándo se inserta alguna imagen, o cualquier otro archivo multimedia, en un post/págna se puede vincular a la página de adjuntos que proporciona WordPress utilizando la <a href="https://codex.wordpress.org/Template_Hierarchy" rel="nofollow ugc">jerarquía de archivos del Theme activo</a> (attachment.php, image.php …$mimetype.php, etc.) y con este plugin puedes evitar que sean indexadas para mejorar el SEO (Search Engine Optimization). 
El plugin de WordPress SEO by Yoast y algunos otros plugins permiten redireccionar las páginas de adjuntos al artículo o página correspondiente, pero en determinadas ocasiones puede que se desee utilizar las páginas de adjuntos sin que se redireccionen y sin que se indexen en los buscadores. (Puedes encontrar <a href="http://www.ampercent.com/prevent-indexing-wordpress-image-attachment-pages/9082/" rel="nofollow ugc">más información sobre esto aquí</a> )
Así que con el plugin Noindex Attachment Pages se añade concretamente la siguiente etiqueta en la cabecera HTML de cualquier página de adjuntos o página de archivos multimedia;
 
Este plugin no tiene panel de opciones, simplemente actívalo.
Alguna sugerencia? Puedes esccribirme o seguirme en <a href="http://twitter.com/jruizcantero" rel="nofollow ugc">Twitter @jruizcantero</a>.

Noindex Attachment Pages

Add META ROBOTS NOINDEX to Attachment Pages in WordPress for better SEO

Disable WP Robots vs Noindex Attachment Pages