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

The Replicate Paragraphs module makes it possible to copy Paragraphs to make new ones.

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

Shortcode is a module which integrates with WYSIWYG that adds tokens for embedding media and other content.

Let's you use a view as a field in a view. The parent view can pass arguments to the field view. This is kind of like a query within a query.

Let you use node tokens in the title and alt fields for the core image module. Core already comes with the option to use user tokens but not node tokens.

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 module with utilities for fields including the ability to copy field instances from one entity type to another.

A nice JS module for drop down and slide out menus