LibreOffice Viewer

LibreOffice Viewer is the official app for the popular open source word processor that lets you open any office document right on your Android device.

The app supports a long list of formats, so you can open any document with any of the following extensions: .odt, .odp, .ods, .ots, .ott, .otp, .docx, .pptx, .xlsx, .dotx, .xltx, .ppsx, .doc, .ppt, .xls, .dot, .xlt, .pps. This means you can open any document created with OpenOffice or Microsoft Office.

LibreOffice Viewer is a good text editor that's continually under development and being improved. Even though its features are a bit limited right now, the number of different formats it supports makes it an app to keep in mind for all those who frequently use text documents on Android.