1. Docs To Go (Google)
Pros: -Includes both Android smartphone & tablet versions in one download
-Viewing, editing, and creating MS Office files (97-2013)
-Viewing PDF files
-Good cloud storage support
-File sorting manager (sorting file list by Name, Modified, Size, etc.)
-Easy navigation
-Localized in major languages
Cons:-Advertisements may bother some people
Size: Around 8 Mb
Requires Android: Android 2.3.3 and up
Available on: Google Play Store, APK4Fun
2. Kingsoft's WPS Mobile Office+ PDF
Pros:-Having support for multiple languages
-Support for multiple file formats
-Cloud storage support
-Evernote support
-DLNA support
Cons:-Sometimes can be slow to open files
-There have been some issues reported with various languages
Size: Around 21 Mb
Requires Android: Android 4.0 and above
Available on: Google Play Store, APK4Fun
3. Microsoft Office Mobile
Pros:-Users can acess, view and edit their Word, Excel and PowerPoint
documents from virtually anywhere
-You can create new Word and Excel documents on your phone
-With your phone, you can access Office documents that are sorted
on OneDrive, OneDrive for Business, or SharePoint
Cons:-Microsoft has been slow on updating the app and fixing bugs
-You will need a Microsoft account.
Size: Around 28 Mb
Requires Android: Android OS 4.0 or later (Android M is not yet supported)
Available on: Google Play Store, APK4Fun
4. OfficeSuite8+ PDF
Pros:-View, edit, and creat Word, Excel, and PowerPoint documents, convert
to/from PDF
-Support for PDF files including PDF camera scanning and Export to PDF.
-Sharing via cloud services like Box, Dropbox, Google Drive, OneDrive,
AmazonCloudDrive and SugarSync, as well as over email, Bluetooth, and
Wi-Fi Direct
-Available in 56 languages
Cons:-If this is preloaded on a phone, it can't be moved to an external SD card
-Also, preloaded means bloatware
Size: Around 40 Mb
Requires Android: Android 4.0 and up
Available on: Google Play Store, APK4Fun
5. Polaris Office
Pros:-Viewing and editing of Microsoft Office documents. PDF also supported.
-Has own cloud storage and also supports other cloud storage services
-Chromecast Compatible: Display your Word documents, Excel
Spreadsheets, PDFs, or Powerpoint Presentations on your Chromecast
connected display
-Supports some major languages
Cons:-Storage is messy. Documents get duplicated fairly often or deleted
entirely.
-Sometimes, the app tends to be buggy
Size: Around 42 Mb
Requires Android: 4.0 and up
Available on: Google Play Store, APK4Fun
If you are interested, you can check-
''Download Your Android Apps from the Best Sites.''