I've tried AbiWord and OpenOffice. They are good alternatives to MS Word, and they run on Linux distributions, Windows, and other OSes.
I must give AbiWord a tighter hug than OpenOffice, since you can actually use it on old computers(it is not a disk space and memory hog for today's computers).
As for WordPerfect, I have an old Windows 3.1 version here, and for me it still rocks.
If my Pentium IV conks out(I'm completely migrating to Slackware 10.2, OpenOffice, and AbiWord on it), I still have my Pentium 166 with OS/2 Warp Connect (ah, the old days) to run WordPerfect.
I bought WordPerfect from a surplus shop, and I think it only costed me P500 (US$10). It was a few years ago, and it was a bargain for me.
Oh, btw, OS/2 was made by IBM. A contributing factor to OS/2's lower popularity when compared to Windows is that big developers(Adobe, Corel, etc.) didn't bother to make software for OS/2. But I still use the OS on a hobbyist BBS.
<small>[ 02-03-2006, 07:44 AM: Message edited by: balky ]</small>