Another LibreOffice user here. I'm planning on going full open source at one time, when I make the jump from Windows 7 for good.
@Lady Celerity I feel obligated to state that LibreOffice is not freeware, but FOSS (Free Open Source Software). Totally different from freeware, because everything's open with open source and you're free to modify the code and distribute it even further. I got that hammered into my skull countless times and already say/type it automatically at this point, sorry
There's a whole ideological movement behind it, btw. Interesting stuff.