FTP client that functions similarly to Dropbox?

I'm trying to help a wonderful designer who is sadly running out of space on her Dropbox, but is already paying for hosting service that has 100GB available for her. Is there a software that works and that is seamlessly integrated within explorer and updates files on FTP that you yourself can assign?

Thanks!

Is FTP faster than Dropbox?

File transfers with Dropbox are faster and more secure than FTP servers. Dropbox simplifies transfers by allowing anyone with the web or desktop app to access the files you share with them—and they don't even need a Dropbox account.

What you are looking for is something like FTPBox http://ftpbox.org/