Google Apps Offline
Even if you rarely use the Google Apps -- Docs (word processor), Sheets (spreadsheets), and/or Slides (presentations) -- check out the Google Apps Offline feature. Google’s building a full offline support environment for its browser, and other companies are slowly following suit, writing Chrome extensions that make use of the offline capability.
To set it up, start on the Google Drive site, enable offline access in your copy of Chrome, then install the add-in. For those of you running Chromebooks, Offline’s already built in. Google has made it one-click easy to turn the feature on and off if you’re absolutely sure your Internet connection will stay up.