The Document Foundation offers a viewer app for LibreOffice documents with experimental editing support for Android devices: https://www.libreoffice.org/download/android-and-ios/ There is the LibreOffice Viewer Android app: https://play.google.com/store/apps/details?id=org.documentfoundation.libreoffice There is the LibreOffice Viewer for F-Droid (the Free and Open Source Android App Repository): https://f-droid.org/packages/org.documentfoundation.libreoffice/ To edit LibreOffice documents there is a LibreOffice-based product in app stores from …