BoxCryptor - Boxcryptor encrypts your sensitive files before uploading them to cloud storage services like Dropbox, Google Drive, Microsoft OneDrive, Box, and many others.
Plupload - Multiple file upload utility using Flash, Silverlight, Google Gears, HTML5 or BrowserPlus!
Mega - Secure File Storage and collaboration
SmartFile - Secure file sharing & FTP hosting for the enterprise.
Google Drive - Access and sync your files anywhere
FancyUpload - digitarald:Harald K - Consultant & Contractor - FancyUpload - Swiff meets Ajax - Swiff meets Ajax for powerful and elegant uploads.