Provides some advanced layout and display options for content. "Display Suite is a module that takes over the rendering of entities."

This module adds a view mode selector field to any entity

Allows for quick editing of field type panel panes.

Lets you do cropping of images. Works with the picture module.

Sponsored by NBCUniversal, the focal point module seems to have been inspired by the image field focus module

The Paragraphs module allows non-technical authors to create complex pages.

When editing a paragraph, the Paragraphs Previewer module lets you see what it will look like before saving.

Popular module for making 'flyout' menus. 430,000 downloads and 80,000 current installs.

"The proposed HTML "picture" element (see responsiveimages.org, but has not been accepted for HTML 5) is implemented as a display formatter for image fields. This module is a backport of Drupal 8 picture module. This module will deliver alternate image sources based on device capabilities to prevent wasted bandwidth and optimize display for both screen and print. "

A nice JS module for drop down and slide out menus