This app provides DOC, DOCX, ODT and RTF rendering capabilities to Floating Apps and doesn't work alone. However, it's necessary for Floating Document Viewer to work correctly.
https://play.google.com/store/apps/details?id=com.lwi.android.flappsfull
https://www.floatingapps.net
Floating Apps is the largest and the most advanced collection of floating apps available on Google Play. Each floating app is a small app that opens in a window and floats over all other apps unlocking real multitasking on your Android phone or tablet!