foneFrame allows you to host your mobile web pages in your Dropbox Public folder. Find out more at http://www.foneframe.com/dropbox/
Hojoki allows you to see and comment on updates in your Dropbox along with other apps like Evernote and Google Docs. Find out more at http://hojoki.com/
Backdrop automatically copies files from Basecamp projects to your Dropbox. Find out more at https://www.backdropit.com/
EntourageBox is the easy way to invite friends to upload files to your Cloud storage folders. You can try it out here.
Cloudiz helps you centralize and share your Dropbox with other clouds, like GDrive and Skydrive. Try it out here.
Auto File Move allows you to move files from/to Dropbox to/from different cloud storage services, get URLs and share files from Dropbox and other cloud services, and automatic transfers using schedules.
This userscript adds some improvements to the Dropbox interface, in particular a tree of the folders on the left side of the screen to allow an easier navigation through the directories. You can grab the userscript here.
You can find a simple userscript to add a Dropbox tab to access your Dropbox account in Yahoo! Mail here. This script has been tested with Chrome as well as Firefox + GreaseMonkey. If you are looking for simple email attachments using Dropbox links, Yahoo! and Dropbox have recently announced a partnership to allow the uploading […]
Automatic scheduled transfers between your FTP or SFTP servers, Box.com, MySQL and other databases, Microsoft SkyDrive, Google Drive, and Dropbox accounts. Visit their website at https://www.mybackupbox.com.