GOOGLEDRIVE + GOOGLEDOCS

Google's web-based office suite and storage option. 
       -Easy to use
       -Excellent sharing and collaborating options
       -Auto backup
       -Easy to access from almost anywhere you can sign-in to your google account
       -Integration with Schoology
       -Coming soon:  Unlimited storage with an education account

From Google

Getting Started
Overview of Google for Education
GoogleDrive Help