A free program for Android, by FIREMOBILE.

Document Reader – PDF, excel, pptx, word Documents is an all-in-one office suite that allows you to view and read Word, Excel, PowerPoint, Text, and PDF files on your phone. It supports all the most common document formats and is a fast, stable, and easy-to-use app. It also has the option to convert your files to PDF, Word, Excel, PowerPoint, and Text. The app is free to use and does not require you to pay for the app or any of the additional files.

You can manage your documents in the app and easily share them with your colleagues or friends. You can also easily search through your documents to find the one you need.