There’s also Softmaker Office, in both free and pay versions. I have the pay version (can’t remember, but under $100), which both reads and writes docx and xlsx. Not sure whether that’s a new addition or because I migrated from free to pay.
Thanks. I’m looking at the SoftMaker site now. The main issue I have with Open Office and Libre Office is that not all of the formatting (e.g. bulleted items and the like) translate to Word properly.