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LibreOffice is pretty damn good
(lemmy.ca)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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The formats are "quasi-open". There's still a lot of proprietary stuff in them. Or undocumented or poorly documented things. MS didn't really want it to be an open standard.
Being compatible with them requires a lot of work to reverse engineer the formats. Some companies make licensing deals with ms to get access to better docs but must keep their code closed. Something libreoffice can't do.