OpenOffice.org is a multi-platform office productivity suite. It includes a word processor that is compatible with MS Word, a spreadsheet, a presentation manager, and drawing program.
I have installed Open Office for several of my customers, and my 18 year old Son is using it and telling his friends about it.
OpenOffice has a user interface and feature set that is similar to other office suites. Sophisticated and flexible, OpenOffice.org also works transparently with a variety of file formats, including those of Microsoft Office.
Available in over 45 supported languages with more being constantly added by the community, OpenOffice.org runs stably and natively on Solaris, Linux (including PPC Linux), Windows, Mac OS X (X11), and numerous other platforms.
This is a large download, so if you have a dial-up connection, you might want to order it on CD.