PowerMaker will be a fully developed Text/Word Processor and Presentation/Slide Manager for MacOS X. Name comes from two commercial Apps it tries to resemble and mix in look and feel as good as possible: PowerPoint by Microsoft & FrameMaker by Adobe
EmTeX is a TeX/LaTeX source editor for the Mac OS X platform. It has a friendly user interface with tag completion, a bibliography editor, and automatic typesetting.
A word processor based on the TextEdit application with a Latex backed.
A simple, lightweight Journal/Diary application built around CoreData.
The AbiWord word processor is a full-featured cross-platform word processor.
Tekstilo is a word processor for Mac OS X (and eventually GNUStep). It is designed to correspond to the WYSIWYM philosophy (What you see is what you mean).
Alpaca is a programmable rich-text editor for authors using Mac OS X. It is built on, and programmable in, Common Lisp, and has a complete Common Lisp programming environment built into it.
The Writers Forge is a fiction authoring suite, an IDE for writers. The tool suite will provide integrated support for writing screenplays and prose, and developing plot and character. The backend will support many target formats, including XML and PDF.