I used Kindwords, Pagestream (I know, more than just a word processor) and have seen ProWrite in the past. I was casting around recently as I was adding software to the A1200T I bought and installed Final Copy version 1.3. I seem to remember vaguely using it and liking it.
I also always enjoyed CygnusED Pro version 2 for some things. I always used it when working on fixing the docs that came up managled at times in software.