Hi there,
http://apfelwiki.de/wiki/Tests/WordAlternativenTest contains a big test of Word Processors running under Mac OS X. The Test is not finished (and would never be, it's wiki) but nevertheless very interesting. In alphabetical order AbiWord, Mellel, NeoOffice and Nisus Writer Express are tested at the moment, more is possible every time.
It's a German speaking Wiki.