Bundle Copy is in Drupal 8 Core CMI. It is a replacement for the Content copy module which lives in the CCK project for Drupal 6.

Replaces administrative overview/listing pages with Views, including Views Bulk Operations.

This module should not be enabled in production environments. These views should be used as starting points or examples only and should be exported and used in custom modules if they are to be used in a production environment.

This is the module that is used on this site for code highlighting.