Peter Westwood

This plugin allows you to run loops within your WordPress templates where you query for children of the current page.
The plugin extra arguments to the list of arguments supported by query_posts().
The query argument <code>child_of</code> is used to add a WHERE to the database query to limit the pages returned to those with a post_page equal to the argument provided.
The query argument <code>child_limit</code> is used to limit the number of pages returned.
The query argument <code>child_offset</code> is used to offset the limiting to allow for pagination if required.

PJW Query Child Of

This plugin allows you to run loops within your WordPress templates where you query for children of the current page.

Gecka

PHP 5 required. Please be sure to check your PHP version before marking the plugin as broken.
Submenu enhances the WordPress 3.x navigation system. When you have a website based on WordPress with a lot of pages, but you need a custom menu, it can be tedious to have to add a menu entry for each page created. Submenu just does it automatically.
Submenu also allows you to put menus or portion of menus anywhere in your site: sidebar, templates or page contents.
Languages available: english, french
Contribute: <a href="https://github.com/Gecka-Apps/Wordpress_Gecka_Submenu" rel="nofollow ugc">This plugin is on GitHub</a> !
<a href="http://gecka-apps.com/wordpress-plugins/gecka-submenu-pro/" title="Discover the pro version" rel="nofollow ugc">Discover the pro version</a> by checking out the <a href="http://www.youtube.com/watch?v=DHjMfD-k2Mo" rel="nofollow ugc">Gecka Submenu Pro video</a>:
<iframe loading="lazy" title="What if you could ?" width="750" height="422" src="https://www.youtube.com/embed/DHjMfD-k2Mo?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>

Gecka Submenu

Works fine for me

Submenu autopopulates any nav menu page item with its children and allows to put menus, or portion of menus, anywhere in your site.

PJW Query Child Of vs Gecka Submenu