WPS Office is a very strong contender for a replacement for Microsoft Office. And you will love it because it is free – officially!
This is the smallest size (less than 37MB) and all-in-one complete free office suite on Android mobile and tablets, integrates all office word processor functions: Word, PDF, Presentation, Spreadsheet , Memo and Docs Scanner in one application, and fully compatible with Microsoft Word, Excel, PowerPoint, Google Doc and Adobe PDF format.
The free templates that are included are great for making good-looking documents on the fly. PDF Converter, PDF Reader and PDF Editor are all bundled in. You can automatically save office documents to the clouds: Dropbox, Google Drive, Box, Evernote and OneDrive. Keep your all documents always up-to-date via cloud service.
It also has a desktop version, which you can sync with, once you register and login.