Mobile Apps for Research & Education: Productivity

Dropbox allows you to sync your files online and across your computers automatically. It provides up to 2Gb of storage for free and up to 100Gb for paid accounts. The app makes it easy to copy files from your computers or other mobile devices to your iPhone, iPod Touch or iPad. Also Android, Blackberry, Kindle Fire. Free.

One place to create, share, collaborate and keep your stuff, accessible on All your devices. Free. iPhone, iPad, iTouch

Make your documents, spreadsheets, and presentations even more brilliant -- right on your iPad, iPhone, or iPod touch. Everything you create in Pages, Numbers, and Keynote, is bound to impress. And even better compatibility with Microsoft Office means you can open, edit and share Office files on your iOS device.
NOTE: The iWorks suite of apps and more are now free on all new Apple devices activated on or after September 1, 2013.

Review, edit, analyze and present with a consistent and familiar user interface optimized for use on your mobile device. Core editing is free for consumers on devices with screen sizes smaller than 10.1".

iAnnotate turns your tablet into a world-class productivity tool for reading, marking up, and sharing PDF documents, Word/PowerPoint files, and images. Every day thousands of students and professionals discover how it helps them work better. Join the more than half million users that already rely on iAnnotate to get work done. (iPad)

DF Expert 5 is a must-have app for anyone who reads, annotates or edits PDF documents on iPad or iPhone. It allows you to mark up documents with highlights and handwriting, insert text and stamps, sign and even merge PDFs. Moreover, PDF Expert is the best choice for filling out PDF forms right on your iPad and iPhone.

Documents To Go is an all-in-one application with support for Microsoft® Word, Excel & PowerPoint, PDF, Apple iWork and other files and attachments. It includes a desktop application (Win and Mac) to provide 2-way file synchronization and a version with support for Google Docs, Box.net, Dropbox and more. For iPhone, iPod Touch, iPad, Android or Blackberry.