Freelance Traveller is currently built using Microsoft Publisher 2010, though some of the early issues were done with Publisher 2003.
For actual writing (authory, rather than editory), I've been known to use Microsoft Word (2003 or 2010, depending on where I am when I'm doing it), Notepad, one or another of the OpenForks, Microsoft Works 9.0, Fliq Notes, OliveOffice Premium, Picsel SmartOffice 2.0, Kingsoft Office/WPS Office, Polaris Office, Docs to Go, QuickOffice, ...