freetools

LMP allows you to add in your sidebar a widget that will display the last modified articles in descending order of modification date.
Settings to customize:
<ul>
<li>Allow you to set title widget</li>
<li>Display Number of items</li>
<li>Display modified date</li>
<li>Display thumbnails</li>
</ul>
If no thumbnail was found for the article, LMP will add a generic image.

Last Modified Posts

Add a widget to display the list of the last modified/updated posts.

ehsan4php

Sometimes when you update one of your pages on the WordPress blog you would want visitors to know about those. This widget will create a sidebar 
box with a list of pages you’ve recently updated. It also shows the date of the update beside the page title. You can choose whether to display the update date and in what format.
You’ve an option to display the Posts in the list as well. If checked (through admin panel) the list will include the Posts along with the list of Pages.
You can use WP’s shortcode to display the last update date of the page or blog posts. Date/time format for the shortcode can be controlled through the widget settings.
V 1.0.4 only fixes the bug related to the widget area where any widget (in admin panel) below RUP’s widget will lockup and cannot be moved.
V 2.0.0 widget code updated to make it combatible with WordPress v. 6.6.2

Last Modified Posts vs Recently Updated Pages