It works on Windows XP - Windows 10, macOS (OS X) and Linux. And it is absolutely free!
LibreOffice is as secure as any other word processor such as OpenOffice or Microsoft Word. You could even say it is more secure, since it is open source and it would be pretty hard to hide malicious code in it. You are safer with libreoffice.
LibreOffice is light and works nearly effortlessly, while G Suites is by far more mature than Office 365, as office 365 itself does not even work with Office products that are installed offline. Office 365 online still suffers from poor performance this year, as per my last attempted use.
Why is LibreOffice free? ... LibreOffice is free because the community around it cares about open standards and breaking down digital divides - creating a world where everyone has access to powerful, open source tools.
LibreOffice is available for free on Windows 10, Mac, and Linux through Libre Office's website.
While we do offer no-cost downloads of the LibreOffice suite of programs, Free Software is first and foremost a matter of liberty, not price.
The answer will be different depending on your needs. If you're able to get free or donated Microsoft Office licenses, that is probably your best option for the support and security. But, if you're using a computer with an older operating system, Open Office is the no brainer.
LibreOffice /ˈliːbrə/ is a free and open-source office productivity software suite, a project of The Document Foundation (TDF)....LibreOffice.