Printer Pro - Print attachments, receipts, documents, web pages from your iPad and iPhone.
BoxCryptor - Boxcryptor encrypts your sensitive files before uploading them to cloud storage services like Dropbox, Google Drive, Microsoft OneDrive, Box, and many others.
CalPrint - CalPrint uses your existing reminders and calendar entries on your iPad or iPhone (Exchange, iCal and Google Calendars etc.
Mega - Secure File Storage and collaboration
Air Sharing - Air Sharing lets you bring your documents with you — without bringing your computer.
Google Drive - Access and sync your files anywhere