At the outset, this article was written in OpenOffice Writer a word processor comparable to Microsoft Word. The Writer is just one part of the suite called OpenOffice.org touted as "open source" competition to Microsoft Office.
The original version was slow and clunky. However, with the latest version (2.0), OpenOffice.org has made it worthwhile to be written about.
Best of all, it's free. One may also note that the OpenOffice.org project, even though open source, has the backing of Sun Microsystems (that also has a complimentary product called 'Star Office'). In fact, the base source code of both these software is the same.