Wysiwyg

The WYSIWYG module is my favorite for rich text editing in Drupal 6 and Drupal 7. (In Drupal 8, WYSIWYG is in core.) Here's how I set it up.

Display Suite

Provides some advanced layout and display options for content. "Display Suite is a module that takes over the rendering of entities."

Focal Point

Sponsored by NBCUniversal, the focal point module seems to have been inspired by the image field focus module

Region View Modes

"A surprisingly simple, flexible layout solution made possible by placing fields in regions. Region View Modes is just a bit of glue to join Drupal's theme regions and View Modes."