Drush Download File is a drush plugin that allows you to download files and place them in locations. This is behavior similar to what a make file can provide except you won't need to write a make file in order to get a file and put it in the right place.
Entity Enqueue provides utility functions to enqueue entities to be processed later using Drupal's Queue API. It will not process any entity enqueued, you have to write the corresponding queue worker callback as always according the Queue API.
Its convenience stems, apart from saving a few lines of Queue API calls each time you create a queue item, from providing matching Drush commands for each possible function.