"The Media module provides an extensible framework for managing files and multimedia assets, regardless of whether they are hosted on your own site or a 3rd party site - it is commonly referred to as a 'file browser to the internet'.

Media is a drop-in replacement for the Drupal core upload field with a unified User Interface where editors and administrators can upload, manage, and reuse files and multimedia assets....

Makes site variables exportable. Uses Ctools. Usually used in conjunction with the Features module.

"File entity provides interfaces for managing files. It also extends the core file entity, allowing files to be fieldable, grouped into types, viewed (using display modes) and formatted using field formatters. File entity integrates with a number of modules, exposing files to Views, Entity API, Token and more."

This module integrates with so many other modules but out of the box can show you detailed node revision diffs.

Create XML Sitemaps and automatically send them to search engines when content is updated or added.

Adds a link field

Amazing module that integrates with both the db and solr (it also supports other backends but some contrib modules don't.)

This module is a building block for so many other Drupal modules.

If you haven't tried this module, try it now. It makes the modules page not suck.

Redirect users to different URIs