BoxCryptor - Boxcryptor encrypts your sensitive files before uploading them to cloud storage services like Dropbox, Google Drive, Microsoft OneDrive, Box, and many others.
Uploadify - Uploadify is a jQuery plugin that allows users to easily add multiple file upload functionality to their website.
Mega - Secure File Storage and collaboration
Fine Uploader - Javascript plugin tool to give your users a smooth experience when uploading files to your website.
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.