OpenOffice (originally from OpenOffice Foundation, and later Oracle) was the default 'Office' suite in all pre-11.04 Ubuntu releases.
current tag: openoffice.org
Apache OpenOffice (AOO) is a free open-source cross-platform Office Suite.
suggested tag: openoffice (aliases: openoffice.org, apache-openoffice)
It supports many languages ,and since version 2.0.4 has supported Extensions (add-ons).