Quoted from: http://wiki.lyx.org/Mac/Mac http://www.lyx.org/

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LyX/Mac, is a fully-featured implementation of LyX on the Mac OSX native graphics display, with the familiar Aqua look & feel and anti-aliased text. LyX/Mac does not require X11.

LyX is a WYSIWYM (WhatYouSeeIsWhatYouMean) DocumentProcessor. Its homepage is at http://www.lyx.org/ and you can probably get a much better description of what it is there.

LyX is an advanced open source document processor that encourages an approach to writing based on the structure of your documents, not their appearance. LyX lets you concentrate on writing, leaving details of visual layout to the software.

LyX produces high quality, professional output - using LaTeX, an industrial strength typesetting engine, in the background; LyX is far more than a front-end to LaTeX, however. No knowledge of LaTeX is necessary to use LyX, although it will give a user more power.