DroppPro is a registration-free, monthly fee-free official client of drupp.net file sharing service.
Once installed, you can share files immediately. Just drop a file (files) to this application, it (they) will be uploaded to the server and you can get the URL for download.
By accessing to this URL, you can download the file from the browser, so it is useful, for example, to pass the large files which have been passed by e-mail.
File exchange is protected by SSL, DruppPro also allows you to send and receive files securely.