new problem

Just a few comments in addition to what Daiya has written:

If you're really looking for a replacement for the complete Microsoft Office
suite, then NeoOfficeJ is definitely what you'll want to have, since it
includes a word processor, a spreadsheet module, a presentation program and
also a drawing module, if I'm not mistaken. Also, NeoOffice, just like
OpenOffice, is completely free, and that aspect is particularly convincing.
Note that it is a 120MB download, though, so you'd better not be using a
dial-up connection for this one.

Another free open source product is AbiWord, which is a not-too-complex word
processor.

Mellel is frequently mentioned in relation to left-to-right text input and
complex foot/endnote managing.

Another word processor worth mentioning is Nisus Writer Express, which is
really nice as it uses Mac OS X's text rendering engine, though it does not
have the complexity of Microsoft Word (or its own Classic-only predecessor,
Nisus Writer).

Then there's Mariner Writer, but I don't know much about that application,
except that it has a rather ugly interface. There's also Mariner Calc, a
spreadsheet application, from the same developers.

And last but not least, there's Apple's newcomer suite called iWork. It
contains two applications, the word processor/DTP program Pages and the
presentation module Keynote, both of which are more or less
Word/PowerPoint-compatible. Note however that at this stage, iWork does NOT
contain a spreadsheet application, though it is likely that Apple will
include one in the next version.

I might have forgotten to mention a few applications, but my list covers the
majority of the modern "Office-like" programs available today. Hope this was
helpful.

Michel