Andreas Norman

This plugin simply lists all subpages from a selected parent page (with option do exclude specific pages) in the sidebar. This widget can be placed many times in your sidebar.

SubZane Sub Page List Widget

Lists all subpages from a selected parent page with option do exclude specific pages.

macnetic-labs

NF Subpages adds pages and fieldset elements to the ‘Layout’ Elements’ block. It also includes labels and custom classes for elements to allow for more interesting layouts and styling. Subpages works only with javascript, otherwise it displays the pages with fieldsets.
This plugin requires the Ninja Forms plugin.

NF Subpages

NF Subpages adds pages and fieldset elements.

SubZane Sub Page List Widget vs NF Subpages