I use LibreOffice on my own computers. If I ever had to exchange documents with anyone else, I don't think I would.<p>A friend and I were trying to pick a format to use for some files we're jointly working on via Dropbox, and .docx was not sharing well between multiple pieces of software. I don't know whether Pages on his iPad was more of a problem than LibreOffice, but either way, we settled on Markdown. It's simple, has 100% compatible editors on all platforms, and works just fine for simple documents.