Migrate: The core API Migrate Drupal: Provides the classes needed to migrate Drupal to Drupal 8. Migrate Upgrade: Provides a simple user interface for running migrations from Drupal 6 or Drupal 7. There is ongoing work to include more of this UI in core. Migrate Plus: This is the current home for the pieces of Drupal 7's migrate functionality that didn't make it into core.