good stack exchange answer explaining various other tex/latex options - http://tex.stackexchange.com/questions/36/differences-between-luatex-context-and-xetex h

good stack exchange answer explaining various other tex/latex options - http://tex.stackexchange.com/questions/36/differences-between-luatex-context-and-xetex http://tex.stackexchange.com/questions/36/differences-betwee...