Elvis Nyakangi

This plugin performs a very simple task. Once a Product or Post has been published and a front-end user with non-admin rights clicks save or update, the product or post will move to Pending Review until it is published by the Admin.
More about the Plugin:
<ul>
<li>This is a light weight plugin that is less than 2 kb. </li>
<li>You do not need any setting. Just install, activate and you are done.</li>
<li>It is a compatible with the latest version of WordPress.</li>
<li>It has been tested and known to work with a number of marketplace themes which allow users to submit and edit products and posts. </li>
<li>It works with Woocommerce WC Vendors plugin.</li>
</ul>

Edited To Pending Review

This plugin performs a simple task of moving edited products or posts to pending Review.

Alex Phelps

Simple Post Alerts 
Allows users to easily get alerts for new posts pending review and published.
<h4>How it works</h4>
Go to your user profile and you’ll see two new settings for pending review and published posts. You can also manage these settings for other users. Each time there is a new post that matches your settings you’ll get a simple email notification with a link.
<blockquote>
Note – users who cannot publish posts don’t see the setting for posts pending review.
</blockquote>

Simple Post Alerts

Allows users to easily get alerts for new posts pending review and published.

Edited To Pending Review vs Simple Post Alerts