LibreOffice is a productivity suite that is compatible with other major office suites, and available on a variety of platforms. It is free software and therefore free to download, use and distribute.
Hours ago, the PPA for LibreOffice created to make installation easy for Ubuntu user.
The PPA provides packages for Ubuntu Lucid, Maverick, and Natty, use following commands to start installation
sudo add-apt-repository ppa:libreoffice/ppa sudo apt-get update sudo apt-get install libreoffice
After installation, launch at Applications -> Office menu.
To read more about LibreOffice, refers to http://www.documentfoundation.org/download/