This Drupal 8 module extends the admin toolbar that comes with Drupal by adding dropdowns.

Search Kint, introduced for Drupal 8, lets you search through Kint's (Devel's) debugging output.

From the Drupal module page, "The Metatag module allows you to automatically provide structured metadata, aka "meta tags", about a website."

This module, in a basic sense, allows the title to be an actual Drupal field. This comes in especially handy when doing translations, as titles are not translatable in core.

"Fieldgroup will, as the name implies, group fields together. All fieldable entities will have the possibility to add groups to wrap their fields together. Fieldgroup comes with default HTML wrappers like vertical tabs, horizontal tabs, accordions, fieldsets or div wrappers."

Drupal 7 core does do css/js aggregation but this.... Super duper CSS/JS thingamabob. Check the project page. Too many features to list here.

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.

"The Paranoia module attempts to identify all the places that a user can evaluate PHP via Drupal's web interface and then block those. It reduces the potential impact of an attacker gaining elevated permission on a Drupal site."

Updates jquery to the latest version that Drupal supports. If you need the latest jQuery for a project, you'll have to add it to your theme manually and should be included using 'noconflict' mode.