LibreOffice is community-driven and developed software which is a project of the not-for-profit organization, The Document Foundation.
The LibreOffice software is developed by users, just like you, who believe in the principles of Open Source software and in sharing their work with the world in a non-restrictive way. At the core of these principles is the promise of better-quality, highly-reliable and secure software that gives you greater flexibility at zero cost. Beyond this, the driving factor behind the community is personal choice and transparency, which translates practically into wider compatibility, more utility and no end-user lock-in to using just one product.
Install LibreOffice 3.3.2 in ubuntu
Open the terminal and run the following commands
sudo add-apt-repository ppa:libreoffice/ppa
sudo apt-get update
sudo apt-get install libreoffice libreoffice-gnome