LibreOffice is the free power-packed Open Source personal productivity suite for Windows, Macintosh and Linux, that gives you six feature-rich applications for all your document production and data processing needs: Writer, Calc, Impress, Draw, Math and Base.
Ubuntu comes with a LiveCD installer. You can run the operating system without changing or formatting your hard drive. I can say it's pretty awesome because there are other things you can do aside from installing the OS. I will tell you that it can even reset your windows administrator passwords.