1. WPS Office + PDF

https://play.google.com/store/apps/details?id=cn.wps.moffice_eng

2.OfficeSuite 8 + PDF Editor

https://play.google.com/store/apps/details?id=com.mobisystems.office

3.Polaris Office + PDF

https://play.google.com/store/apps/details?id=com.infraware.office.link

From Microsoft

Microsoft Office Mobile

https://play.google.com/store/apps/details?id=com.microsoft.office.officehub

 can be download separately

Microsoft Word
https://play.google.com/store/apps/details?id=com.microsoft.office.word

Microsoft Excel
https://play.google.com/store/apps/details?id=com.microsoft.office.excel

Microsoft PowerPoint
https://play.google.com/store/apps/details?id=com.microsoft.office.powerpoint

Microsoft Outlook
https://play.google.com/store/apps/details?id=com.microsoft.office.outlook
 
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