"Workbench provides overall improvements for managing content that Drupal does not provide out of the box. Workbench gives us three important solutions:

• a unified and simplified user interface for users who ONLY have to work with content. This decreases training and support time.
• the ability to control who has access to edit any content based on an organization's structure not the web site structure
• a customizable

Seems like a nice way to get a responsive grid for views without doing any custom theming. I haven't used it yet.

"This module performs additional validation when a node is created or updated by a user to require that a node's title, author, language, and CCK fields are unique within a given context." There are many different contexts including content type. So, for example, you could make sure that nodes of a certain content type have unique titles.

Control <meta> tags

Included in Drupal 8 core, this plugin gives a nice javascript walkthrough on any page.

Insert is the easy, secure way to let editors add images and links to files using WYSIWYG editors.

Flag is the ultimate bookmark tool. A must learn module.

Gives views exposed filters more options: checkboxes/radios + select all/none

• create view
• add page display
• set path
• add filter
• search: search terms
• expose the filter if you want

Drupal 7