Gerhard Potgieter

WooCommerce Auto Restore Stock will automatically restore your WooCommerce inventory/stock for orders that was placed and refunded or cancelled.
The inventory/stock restore is triggered when the order goes from on-hold, processing, completed to either cancelled or refunded status.
When WooCommerce Auto Restore Stock restores the inventory/stock it will also add order notes to the order in question to show the adjusted values and to indicate that inventory/stock was restored.

WooCommerce Auto Restore Stock

Performed as described. Saved me some time!

Works great

Still working

Automatically restore your WooCommerce inventory/stock for orders that was cancelled or refunded.

Fresh-Media

In previous versions of WooCommerce, when an order status changed from pending to cancelled, an email notification was sent automatically. 
In WooCommerce 3.0.8, however, they’ve removed this (see <a href="https://github.com/woocommerce/woocommerce/blob/master/CHANGELOG.txt" rel="nofollow ugc">changelog</a>).
This (very) simple plugin brings back this email.
Thanks to @lomars for the code he shared on <a href="https://stackoverflow.com/questions/45732404/send-an-email-notification-when-order-status-change-from-pending-to-cancelled" rel="nofollow ugc">this</a> Stack Overflow question.

WooCommerce Order Pending To Cancelled Email

A really useful plugin althougth it is a really simple one.

A lot of poetry in so few lines of code!

Thank you

As simple as useful

Brings back the email notification when an order status changes from pending to cancelled.

WooCommerce Auto Restore Stock vs WooCommerce Order Pending To Cancelled Email