The new v.1.0 final stable release of LuxRender is out now. It’s a high-end “physically based and unbiased rendering engine” that works with Poser Pro 2014 and DAZ Studio. Free software, both for personal and commercial use.
For a survey of other high-end external render engines for Poser, see my posting from back in March 2012.
Carrara 8 is DAZ Studio's official 'big sister' software.
Carrara loads all DAZ and Poser characters and scenes,
and supports LuxRender for top-quality realistic rendering.