Internal Program Version: odt2txt  0.5

odt2txt is a command-line tool which extracts the text out
of OpenDocument Texts produced by LibreOffice, OpenOffice.org,
StarOffice, KOffice and others.

odt2txt can also extract text from some file formats similar
to OpenDocument Text, such as OpenOffice.org XML (*.sxw),
which was used by OpenOffice.org version 1.x and older StarOffice
versions. To a lesser extend, odt2txt may be useful to extract
content from OpenDocument spreadsheets (*.ods) and OpenDocument
presentations (*.odp).

https://github.com/dstosberg