Wysiwyg Feb 23rd, 2013 (updated Oct 11th, 2017) 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. Read more about Wysiwyg
Title Dec 6th, 2014 (updated Nov 6th, 2015) 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. Read more about Title
Views Feb 23rd, 2013 (updated Nov 16th, 2014) Download over 3.5 million times, this module is an insane query builder. Learn it. Read more about Views