"CER keeps reference fields in sync. If you have two entities that refer to each other using Entity Reference (or some other kind of reference field), it saves you the trouble of double-editing your entities in order to have them point at each other. If entity Alice references entity Bob, CER will make Bob reference Alice, and keep the references up-to-date when either entity is updated or deleted."

This module extends Drupal's core taxonomy so that, among other things, terms data is stored for unpublished nodes.

Maintained by Dave Reid, Earl Miles, Damien McKenna and Derek Wright

Smart Trim implements a new field formatter for textfields (text, text_long, and text_with_summary, if you want to get technical) that improves upon the "Summary or Trimmed" formatter built into Drupal 7

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: ...

Download over 3.5 million times, this module is an insane query builder. Learn it.

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.

Similar to Features and CINC, "The configuration management module enables the ability to keep track of specific configurations on a Drupal site, provides the ability to move these configurations between different environments (local, dev, qa, prod), and also move configurations between completely different sites (migrate configurations) without the use of modules with all configuration being owned by the site."