Kingsoft Office Free 2013
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Full user review
"Great free office suite which I'll stick with"
It has the most used features of Microsoft Office, and it's free. Nice UI and need no learning curve.
Some features are lack, such as thesaurus. Waiting this feature in next update.
Actually I have been using this software for like two years now. I used open office and libreoffice before, but I'm more interested in the rainbow-styled interface, so I killed these two. Kingsoft Office has most used features of Microsoft Office, and compatible with all Microsoft Office files. I have to mention that their support team is great and really helpful. So I'll stick with it.