This is very very cool. There is an open source (free!) Office suite. I haven't tried it yet, but I plan to install it on a spare computer at home soon.
Supposedly this is 100% compatible with Microshaft Office, presumably without some of the extra features.
That's okay by me, because I haven't found any new useful features since Office 97. All that extra crap Microshaft throws in to get people to buy new versions just slows it down and makes it bigger.
So if you can't afford MS Office or don't need the bloat, try out: