Create visual hierarchies of site pages. Options to list all pages, subpages, current page siblings. Also able to show page featured image and custom excerpts.

wp_list_sub_pages will list only pages within the same category (top-level parent) as the current page.

Widget to display a navigable tree of pages.

That plugin allow you to create a sitemap of your site. Use [zakisitemap] shortcode

Get a tree view of all your pages directly in the admin menu. Search, add, edit, view, re-order – all is just one click away!

Sidebar widget displays a navigable tree of pages and subpages with expand/collapse capability.

Nested Pages provides a drag and drop interface for managing pages & posts in the WordPress admin, while maintaining quick edit functionality.