Here is the list of very useful plugins that helps the wordpress plugins & theme developers. This plugins helped our team to easily debug and test code which will reduce development time.
WP Mail Logging
WP Mail Logging is a plugin to log emails sent by WordPress or WooCommerce. By default, WordPress and your web host do not log, store or keep track of emails sent from your website. WP Mail Logging help you to know which emails your WordPress sends for debugging purposes. Simply activate it and it will work immediately, no configuration necessary.
WordPress.org Plugin Page : https://wordpress.org/plugins/wp-mail-logging/
WP Hooks Finder
WP Hooks Finder helps theme or plugin developers to quickly see where all the action and filter hooks are on any WordPress page.
WordPress.org Plugin Page : https://wordpress.org/plugins/wp-hooks-finder/
Preview E-mails for WooCommerce
Preview E-mails for WooCommerce is a plugin for WooCommerce that lets you Preview Emails, without having to send them.
WordPress.org Plugin Page : https://wordpress.org/plugins/woo-preview-emails/
WP Crontrol
WP Crontrol enables you to take control of the cron events on your WordPress website.
WordPress.org Plugin Page : https://wordpress.org/plugins/wp-crontrol/
Create Block Theme
The Create Block Theme plugin allows you to create new themes, child themes, style variations, and export themes directly from the WordPress Editor. It saves user changes, ensures templates are export-ready, and handles assets. Ideal for developers, but changes are permanent.
WordPress.org Plugin Page : https://wordpress.org/plugins/create-block-theme/