http://www.openoffice.org/
A year or 2 ago I tried Open Office 1.2 and it was ok, it was better than buying Microsoft Office but there were things I didn't like.
I hadn't paid any attention to it in a while.
I guess earlier in the year there was a big deal about the drafting of a universal "Open Document Format" and it has been adopted by 3 or 4 major companies and various governments.
At some point Open Office 2.0 was released and is supposedly a major improvement over version 1.
Haven't tried it yet, too many Quake files taking up my hard drive space, but version 2.0 is supposed to kick some ass