I use Office 2003 still. I binned Windows 8 as failed OS. I may get the next version when it has been running for a few years. Took me 3 years to use Win7, and they never de-bugged that with its silly filing system. This new app on my kindle is the same. May work after a while, but its currently a pain to use with no mouse or keyboard and unfinbable arrow leys
Howard.
I voted for Kingsoft Office but don't use it as a replacement for MS Office. I use MS Office on my Windows machines but use Kingsoft Office on my Android phone and tablet since MS Office doesn't run on Android devices.
I don't believe OpenOffice is developed by Corel, especially since Corel is still selling a Corel Office suite.
Nonetheless, OpenOffice is a good choice.
I will vote Kindsoft, it is good and now I am using it on my computer.