Create administrative panes that can be injected just about anywhere.

A cache plugin for Panels (and other CTools displays) that is aware of content changes.

"Panels are great, but how do I change this one page?"

From the project page: "Provides a new Forms API element which is a select/radios/checkboxes element that has an 'other' option. When 'other' is selected a textfield appears for the user to provide a custom value."

Modify the default Panels markup. Use with Fences for ultimate control.

"Some content/nodes should never be viewed directly; only visible be through something else such as Views or Panels. This module denies access to node/[nid] URLs while allowing the content to stay published and otherwise viewable."

Also see Rabbit Hole

"A system for building "megamenu" -style (explanation) dropdown menus using Mini Panels, which provides tremendous flexibility in what can be displayed." Read documentation from Damien McKenna: https://drupal.org/node/1358006

The node access module is a popular module and is handy in that you can configure Drupal role based view/edit/create access on a per content type and per node basis.

"The RealName module allows the administrator to choose fields from the user profile that will be used to add a "real name" element (method) to a user object. Hook_user is used to automatically add this to any user object that is loaded. It will also optionally set all nodes and comments to show this name."

Allows for selectively turning elements that are usually rendered in page.tpl.php into blocks.