Open Office

It's a free ofimatic suite, excelent alternative to Microsoft Office, compatible with Windows and Linux. Great  quality with professional results.

The package is the next:

- Writer: word processor. Recognizes .doc files of Word. It can export to PDF and XML. Edition HTML

- Calc: spreedsheet. Export to PDF

- Impress: presentation program

- Base: database management program

- Draw: A vector graphic editor and diagramming tool

- Math:  tool for creating and editing mathematical formulae

Open Office web:

http://www.openoffice.org/