There's Wings3D. Used by many pros who own Max, Lightwave, Maya, C4D and XSI as their starting tool beause of its ease of use. Dr Geep just recently showed here on this forum how to create morphs for poser in it. Then there's Silo. Costs a bit, but has a brlliant future. Sometimes the "biggies" have a free version on some CDs of some magazines. But when you really "know" how to work with Wings or Silo you'll be able to create many, many props for Poser. A hint (if you don't mind): download freebies and open the .obj file in, say, Wings. It'll tell you a lot on how to create wht you are looking for.

I have tried prudent planning long enough. From now I'll be mad. (Rumi)