Santi

This plugin combines admin cleanup with a built-in SEO module — no third-party SEO plugin needed.
Admin features: 
* Removes “Posts” and “Comments” from the admin menu 
* Disables comments and pingbacks across the entire site 
* Disables the Gutenberg block editor and restores the classic editor 
* Removes the comments admin bar link and related widgets 
* Allows SVG, ICO, TTF, and EOT uploads to the Media Library
SEO features (Settings > Santi Tech SEO): 
* Custom SEO title and meta description per post/page with live character counter 
* Open Graph tags (og:title, og:description, og:image) for social sharing 
* XML sitemap at /sitemap.xml — automatically includes all published pages and posts 
* Canonical tag per page 
* Robots meta tag per post (index/noindex) 
* Title template with variables (%title%, %sitename%, %sep%, %page%) 
* Noindex for search results, date archives, tag archives, and author pages 
* Schema.org JSON-LD: WebSite on all pages, Organization/Person on homepage, Article on posts/pages

Santi Tech Disable Posts & Comments

Removes "Posts" and "Comments" from the WordPress admin, disables comments and Gutenberg, allows custom file uploads, and includes a full SEO module.

Alan Cesarini

The Void is ideal for test sites. This plugin deletes all content in a WordPress single site. It deletes posts, pages, tags, categories, custom post types, taxonomy terms and menus. 
No filters or parameters. The Void cleans your site with just one click.

The Void

Removes all content in a WP site with just 1 click.

Santi Tech Disable Posts & Comments vs The Void