A free app for Android, by BigSoft inc..
Document Reader – PDF, excel, pptx, word Documents is a free and easy-to-use app that allows you to view and read all document files on your mobile device. It supports PDF files, and other formats such as MS Word, Excel, PowerPoint, Text, and more.
You can easily search through all your files, and view them in a new window or on the main screen. You can also add them to a folder and move them around to change the order of your files.
The app has a simple and intuitive interface, which makes it easy to use. It also has a powerful search function that makes it easy to find files that you want to read.
You can share your documents on Facebook, Twitter, Google+, and other social media. The app also has a text-to-speech function that can read out your documents.