Les Harris

The Pressbox plugin adds a new tab to the Media Upload screen that allows you to insert images and files from Dropbox into your posts.
Additionally, the plugin provides a new shortcode that lets you add links or display images anywhere you want on your blog.
This plugin is under heavy development so please feel free to send me feedback, bug reports, and feature requests!
Credits:
This plugin bears a great debt to the work of Joe Doleson’s Wp To Twitter plugin for his excellent example of OAuth integration with WordPress.

Pressbox

Integrates DropBox with your blog allowing you to post images and files directly from your DropBox. Requires PHP 5.2 and cURL.

Denis Buka

This plugin allows you to upload single files or entire directories with subdirectories to your Dropbox account. You can use it for backup, synchronization or whatever uploading tasks you may have.
Features overview:
<ul>
<li>Upload entire directories with subdirectories to your Dropbox account. </li>
<li>Backup your entire site files by pointing to the WordPress installation directory. </li>
<li>Specify a Dropbox folder to which your files should be uploaded. If such folder doesn’t exist it will be created. </li>
</ul>
My other plugins:
<ul>
<li>Intuitive Navigation (https://wordpress.org/extend/plugins/intuitive-navigation/) </li>
<li>Generate Cache (https://wordpress.org/extend/plugins/generate-cache/) </li>
</ul>
Links: <a href="http://steamingkettle.net" rel="nofollow ugc">Steaming Kettle Website Design & Video Production Studio</a>

Drop in Dropbox

Upload single files or entire directories with subdirectories to your Dropbox account.

Pressbox vs Drop in Dropbox