Sometimes Display Suite will render fields out of order. Use hook_ds_pre_render_alter() to change the order.

With the Field Conditional State module you can change the state of any supported fields form element depending on the content of other fields. This is done by providing an UI for Drupal's States API. All the changes made to a form by FCS (Field Conditional States) utilize only the States API and therefore are clientside only.

This module is basically the Drupal 7 successor to CCK 3's Multigroup in Drupal 6. A similar module is the Inline Entity Form. Caution: ...

From the project page on d.o. "This module provides a neat solution for cutting off the text without taking any HTML tags into consideration. It uses a regular expression containing all the words of a trimmed textual representation of the field value to extract the wanted block of HTML."

The best reference module for Drupal. This is supposed to be in core for Drupal 8.

By using the version of Geshi found at https://github.com/easybook/geshi , Sass and Twig syntax highlighting can be added to text fields in Drupal.

Let's you create, edit, and delete entity references from any form that includes an entity reference field.

This module might not work well with translation and workbench moderation.

Also see Field Collection

"This module provides an advanced Entity Reference widget that uses a view embedded in a modal dialog for selecting items. The view can be paginated and have exposed filters."

The Payment module is a simple way to do commerce. See The Payment Module: A Simpler Alternative to Drupal Commerce, https://www.ostraining.com/blog/drupal/payments/

"The Media module provides an extensible framework for managing files and multimedia assets, regardless of whether they are hosted on your own site or a 3rd party site - it is commonly referred to as a 'file browser to the internet'.

Media is a drop-in replacement for the Drupal core upload field with a unified User Interface where editors and administrators can upload, manage, and reuse files and multimedia assets....