The DAZ Hexagon 3d modelling software is currently on sale at $7.98. Somewhat old now, not having been developed for a few years, but fairly easy to learn and still perfectly capable of producing props and getting them to DAZ Studio and Poser in a quick way. I grabbed mine years ago, back when it was free, but it’s been full price for a while now. For your first step in learning it, Fugazi1968’s “Make your own Starfighter Tutorials” are well worth your $10, taking you through the basics in a very practical “let’s make something” way.
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.