Development either slowed or stopped for openoffice after it was bought by oracle/sun I believe, so the main guys behind it moved over and created LibreOffice.
I'd like to update my original post as well. I have recently taken a course in the study of Microsoft Office 2010 and was "forced" to purchase a copy for the course. I have to say, it was well worth the price tag. Can't say the new price model for 2013 is, as I'm not a big fan of subscription based systems. But 2010 is awesome. If you can find it on discount I highly recommend picking it up.
Besides the normal applications bundled in the suite, OneNote took me by surprise. I can't live without now for any heavy work. Really hope MS reconsiders their pricing model for 2013.