Hi i just would let someone loving Drupal know that. Drupal 8.0 just released one month ago. And now if you are looking for awesome Drag Drop Builder For Drupal 8 that is available and compatible with Drupal 8.0 . Check the video to see how it works: https://youtu.be/nUiRRI-uOsA?list=PL9jvxTIzo9c4klOaa7T7Mkv4xYG6pFQc6