OpenOffice.org is a multiplatform, multilingual, open-source free alternate for Microsoft Office Suite. OpenOffice.org is a complete suite having word processing, spreadsheets, presentations, graphics, database and much more. OpenOffice.org is easy to learn and is compatible with Microsoft office suite. It can save files in all major version of Microsoft office Suites.
The latest version OpenOffice.org 3.3.0 has many new feature, details about these features can be found at official feature page.