LibreOffice as well as OpenOffice have the same ancestor: StarOffice. This was produced by the German software company named StarDivision GmbH in Hamburg from 1985 until 1999. Founder Marco Börries started this company when he was 17 years old, so he's born in 1968. When he sold it to Sun Microsystems he probably earned a nice two digit million number of dollars, the price was never disclosed.
Sun then open sourced this thing, and rebranded it as OpenOffice. And here we are.
If you need to use Docx files and don't want to use Microsoft Office nor Libreoffice, you can also use Softmaker Office. This is a proprietary office suite developed since 1987 by German software company Softmaker GmbH based in Nürnberg. It's shareware, and you have got a 30 day trial period. It's available on Windows, Linux and MacOS. Full license price is 50 Euro, so it's not really expensive.
A big focus of Softmaker Office has always been maximum compatiblity with Microsoft Office; in fact their Docx import and export functionality is light years ahead that of LibreOffice. Where LibreOffice just displays utter garbage on import or export, Softmaker Office displays exactly the same as in M$ Word.
So there are people out there who don't want to use M$ Word nor Libreoffice, but need maximum compability with Docx and instead use this. The office suite contains a word processor, spreadsheet and presentation program.
SoftMaker Office: GDPR-compliant privacy. The alternative to Microsoft Office for Windows•Mac•Linux•iOS•Android. PDF editor FlexiPDF as an alternative to Acrobat.
www.softmaker.com
And no, not working for them, nor affiliated whatsoever.