QuickOffice app for Microsoft Office documents is the way to go for doing any real work on mobile devices. And the revamped version is free to anybody with a Google account. It’s available for iPhone, iPad and Android operating system. You can create, open, and edit Microsoft files and save them locally or to Drive, Google’s cloud service. Create and view presentations, spreadsheets, and document or text files right on your phone or tablet, reports netted.net. Even .ZIP folders.
Download free versions from Google Play and Apple’s App Store.