Office suite by the Document Foundation. Forked from OpenOffice. Good accuracy for import/exporting Microsoft documents.

Either install an appropriate package from the list below, are use GetLibreOffice tool.
Libreoffice-3.5.2.pet 151M, US language pack.

Get the language packs from the libre site. (debs are easiest).
Required for office productivity: SFS | PET

GetLibreOffice - Tool for install LibreOffice (with GUI)
OpenOffice

LibreOffice homepage
GUI to download LibreOffice - beta quality thread
LibreOffice PET packages post