Configuration Update Manager Jun 23rd, 2016 (updated Jul 3rd, 2016) This module is essential for configuration management in Drupal 8 Read more about Configuration Update Manager
Bundle copy Apr 17th, 2014 (updated Feb 2nd, 2016) 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. Read more about Bundle copy
Ctools Plugin Stub Aug 30th, 2014 (updated Nov 6th, 2015) "Ctools Plugin Stub is a Drush plugin that can help you generate code stub files for ctools plugins." Read more about Ctools Plugin Stub