Dogan Ucar

WP Last Modified adds the ‚last_modified_date‘ shortcode to your WordPress installation. This shortcode shows the last timestamp of your post/page. Simply use the „format“ attribute for custom date formats (it uses PHP’s date() function). 
The “description” attribute enables a brief description which changes has been made with the last modification. 
WP Last Modified shows also the actual revision of and the publication date of the post/page. 
You can customize the text which will be shown under each post/page under settings -> WP Last Modified Settings. You can also hide one of the elements if you do not want them.
With version 1.1.0, WP Open Last Modified was renamed to WP Last Modified.
Features:
<ul>
<li>last modification timestamp of a post/page</li>
<li>publication timestamp of a post/page</li>
<li>timestamp format customizable</li>
<li>revision count</li>
<li>custom text with placeholders</li>
<li>last modification description</li>
<li>excluding single posts/pages from displaying the last modification timestamp</li>
</ul>

WP Last Modified

This plugins adds the last modified date, current revision and the publication date of your post/page. Simply use the shortcode [last_modified_date]

Albert Peschar

This plugins appends the file modification time to style and script URLs, so that changes are effected immediately, even if the theme or plugin version is not changed.
It will not slow down your site because resources are only reloaded when they change.
Attributions: The plugin logo icon is by <a href="https://www.chanut-is.com/" rel="nofollow ugc">Chanut-is-Industries</a>.

Cachebuster

This plugin has been amazing. Gone are the days where I have to tell the client "if something doesn't look right then try refreshing the page, clearing the cache or using an incognito tab".

Deserves More Attention

Amazing that it only has 100+ installs. Life was so much harder when I had to tell clients to clear their browser cache all the time, and users had a bad experience until their browser cache was refreshed. This plugin completely removes those hassles. Thanks a lot. 

Seriously useful plugin

Stop force refreshing or clearing your browsers cache by preventing caching of stale files.

WP Last Modified vs Cachebuster