ONLYOFFICE Desktop Editors is a free AGPL v3 licensed office suite that
combines text, spreadsheet, and presentation editors. It is fully
compatible with Office Open XML formats: DOCX, XLSX, and PPTX, which are
its native formats. It also supports DOC, ODT, RTF, TXT, PDF, HTML,
EPUB, XPS, DjVu, XLS, ODS, CSV, PPT, ODP.

ONLYOFFICE Desktop Editors is an offline version (using Chromium
Embedded Framework) of the ONLYOFFICE enterprise-level online editing
suite.

The source code of the ONLYOFFICE Desktop Editors is available on
https://github.com/ONLYOFFICE/DesktopEditors but without a build
instruction, so this script repackages the .deb package provided
on https://www.onlyoffice.com/download-desktop.aspx and
https://github.com/onlyoffice/desktopeditors/releases