To my surprise, what used to be called iWork has been my main "Office" replacement for years now. It's good enough, and it's free. I have switched over most of the non-technical people in my life to it, and they have no issues using it (except if they email a .pages document to a Windows user). I especially enjoy Numbers and the way you can arrange multiple tables on a page. It's a different paradigm coming from Goog…
TeXshop on the Mac is however rather nice.