Glen Scott

When a user updates their profile details, this plugin will record the data and time of that update. The date and time will be shown to the administrator through the Users -> All Users page

User Last Modified

Adds a last modified timestamp to user profiles

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.

User Last Modified vs Last Modified Posts