OpenDocument Reader - view ODT

OpenDocument Reader lets you view and modify Open Document Format files (ODT, ODS, ODP) created with LibreOffice or OpenOffice on the go. You can open documents from Gmail, Google Drive, iCloud, OneDrive, Nextcloud, Box, or use the built-in file explorer. Read in fullscreen, search for keywords, and copy text. The built-in editor enables quick edits offline, including fixing typos before sharing with colleagues.

Beyond ODF, it supports a wide range of formats, including PDF, images, archives, audio, video, and OOXML Office formats. This open-source app is made in Austria, with optional ads that can be removed from the in-app menu.