duplicate-post
There are 3 repositories under duplicate-post topic.
littlebizzy/duplicate-post
Easily duplicate (clone) any post, custom post, or page which are then saved in Draft mode, saving you tons of time and headache (no settings page).
daomapsieucap/fiber-admin
💈 Bring multiple customization features to make your own WordPress admin.
vcian/duplicate-me
Duplicate Me plugin is useful to clone data of page, post and custom post type in backend.