MrXHellboy

This plugin will provide you a new widget, showing the last modified items. 
You can customize the widget with 5 settings: 
– Title 
– Amount 
– Text between title and date of modification 
– Show the date 
– Post type.
<h3>Development Blog</h3>
<a href="http://online-source.net/category/open-source/scripts-wordpress-plugins/" title="Online-Source WordPress plugins" rel="nofollow ugc">Online-Source WordPress plugins</a>

Last modified items Widget

List your last modified items through a widget. Quick and easy.

xhark

Displays the date of last page/post modification (if applicable, no modification = no display).
Français : Ce plugin affiche la date/heure de modification d’un(e) billet/page. Si aucune modification, rien ne sera affiché.
<h4>Changelog</h4>
<ul>
<li>11/19/2008 : Add new function, add a CSS class, last_post_mod() works without additional sql query</li>
<li>11/17/2008 : Birth of version 1.0</li>
</ul>
Please <a href="http://blogmotion.fr/public/wp-plugins/wpx-lastpostmod" rel="nofollow ugc">read the documentation</a> for details.
For Support contact Mr Xhark : tiplus@free.fr
Thank you for your feedback 😉

WPX-LastPostMod

Displays the date of last page/post modification (if applicable, no modification = no display). Français…

Last modified items Widget vs WPX-LastPostMod