Jordi Cabot

In the Settings->Discussion page, authors of a post can use the checkbox Email me whenever – Anyone posts a comment.
But this does not send an email as well to the site admins. In blogs where you have a number of guest authors, you may want to be informed about all the new comments so you can respond (if the author is missing) or just participate in the discussion.
As a site admin myself, I was missing many comments. This means plenty of missing opportunities to engage with your audience.
To solve this situation, the plugin adds a new checkbox in the Discussion page. If checked, admins will get an alert email for new comments.

Comment Admin Notifier

Very simple plugin that doesn't try to do many things. But the one it does is very useful: as a website owner you want to make sure you're on top of all the comments in the site even comments to posts you didn't write. 

It does one thing and it does it right

With this plugin, admin users get an email alert every time a new comment is posted on ANY post in the site.

CloudRedux

Better showcase and display notices on your WooCommerce store
Ever wanted to show notifications, alerts, announcements or general notices on the product pages of your website? Product Notices for WooCommerce makes it a breeze for you!
Now, make your notices on your eCommerce websites stand out more than ever! With the new Product Notices for WooCommerce plugin, highlight the most important announcements or showcase discounts on all or on any product page.
With its two customization options:
<ol>
<li>
Global Notices– These are the notices that you can highlight across your store. This feature allows you to set up notices to show on all the products. It may be some kind of market announcement, alert, or for any other criteria.
</li>
<li>
Per-Product Notices-This feature allows you to show notices on a per-product basis. The notice may be in form of promo, discount, or any other criteria. This feature also allows you to hide the global notice from the page, thus allowing custom store notices an easy task.
</li>
</ol>
<h3>Setting up more than one Global and Per-Product Notices</h3>
If you wanted to show multiple notices, for instance, trying to show more than one product promo/discount, update, etc.
<ol>
<li>You can find the Product Notices menu by navigating to the Dashboard in WordPress.</li>
<li>Click on the Add New button and enter the desired content in the Notice Text field.</li>
<li>The Display Rules tab allows you to set up the product notice to show on all products in the store or on certain categories, tags, and products.</li>
<li>You can select from a set of default or custom appearance styles to control how your notice appears on product pages using the Notice Appearance dropdown.</li>
</ol>
<h3>Setting up Global Notice</h3>
In order to set up a Global Notice for the products on your store:
<ol>
<li>Navigate to the Settings menu under WooCommerce on the WordPress Dashboard.</li>
<li>Click on the Product Notice tab and use the settings field to set up the product notice to show on all the products in the store.</li>
<li>Choose from a set of default appearance styles to set-up how your notice shows up on the product pages using the Notice Appearance dropdown.</li>
</ol>
<h3>Setting up Per-Product Notice</h3>
If you would rather show a notice, alert, announcement, etc. only on one or more and not all the products in your store, the plugin allows you to do just that.
<ol>
<li>Head to the Edit Product screen for a product and look for the Product Notice/Information metabox.</li>
<li>Add the desired content in the Notice Text field.</li>
<li>Choose from a set of default appearance styles to set-up how your notice shows up on the page using the Notice Appearance dropdown.</li>
</ol>
<h3>Display notices effortlessly, with Shortcodes</h3>
The plugin also offers built-in shortcodes to display notices on the website. The shortcode allows you to display both global and a specific-product notice on a desired page or post.
<ol>
<li>Use <code>[crwcpn-notice]</code> shortcode to display the global notice as configured in the plugin settings.</li>
<li>To show the product notice on a different location on the product page, you can use the shortcode with an additional attribute <code>type</code>. So, the shortcode <code>[crwcpn-notice type="product"]</code> will display product notice on the product page at the desired location.</li>
<li>If you wish to show a product specific notice on a different page, post or elsewhere on the website, you can use the <code>id</code> attribute of the shortcode to do so. Using this <code>[crwcpn-notice type="product" id="123"]</code> will display the notice configured for the product with ID 123 on desired location on the website.</li>
</ol>

Product Notices for WooCommerce

Make the best of product announcements, promos, discounts, alerts, etc. on your eCommerce site with this one of its kind WooCommerce extension.

Comment Admin Notifier vs Product Notices for WooCommerce