LibreOffice
I use LibreOffice on a Mac. It is good. It will even open Visio drawings, which is nice.
But my daughter also uses LibreOffice and trying to round trip documents -- author them on LibreOffice/Mac, edit them at school on Word/Windows, edit them again at home on LibreOffice/Mac -- fails too often to make for happy users. There's only so many times you're willing to go and fix formatting details.
So I'd strongly recommend LibreOffice/Mac if you are able to share the document as an unrevisable PDF. If you need to edit the thing then either use LibreOffice or Word at both ends.
Biting the hand that feeds IT
