Notify Duplicate Title

Media Tracker is a WordPress plugin to find and remove unused media files, manage duplicates, and optimize your media library for better performance.

ACF Pro 5.9 comes with a duplicate row feature on its own.

Post cloner allows you to easily make complete duplicates of any post on your site. That includes posts, pages and custom post types.

A widget that can act as a duplicate of another widget (for synchronized use in another sidebar)

Duplicate posts, pages or custom posts with a single click.

Allow you to duplicate menu items and their sub-elements in Appearance > Menus