KOffice - "KOffice is a free, integrated office suite for KDE, the K Desktop Environment."
Free
OpenOffice - "OpenOffice.org is a free productivity suite compatible with all major office suites."
Free
602 PC Suite
Home Use version available.
EasyOffice
Free version available
OpenOffice - "OpenOffice.org is a free productivity suite compatible with all major office suites."
Open Source