Poodle Plugins

Stock Message For WooCommerce adds a powerful notification system to your WooCommerce store that lets customers sign up for back-in-stock alerts. When products return to stock, subscribed customers automatically receive customized email notifications.
Key features:
<ul>
<li>Customizable “Notify Me” buttons with full styling controls</li>
<li>Email verification system for subscriber validation</li>
<li>reCAPTCHA integration (v2/v3) for form security</li>
<li>Support for simple, variable and grouped products</li>
<li>Automated back-in-stock email notifications</li>
<li>Subscriber management dashboard with search and filtering</li>
<li>Customizable email templates with product variables</li>
</ul>

Stock Message For WooCommerce

Enable customers to receive email notifications when out-of-stock products become available again in your WooCommerce store.

nerdywp

This plugin will let you hide out of stock products in WooCommerce but only for certain categories. WooCommerce currently lets you either hide all out of stock products or none. This expands on that and lets you choose a category to hide when out of stock.
You might want to use this to keep newer products on your website eventhough they’re out of stock. Hiding the older, out of stock WooCommerce products would remove some clutter.

Hide Out Of Stock By Category

An easy and simple way to hide products in WooCommerce by category when they're out of stock

Stock Message For WooCommerce vs Hide Out Of Stock By Category