Yes, Truespace is free. I tried to import and render some Poser scenes, but I gave up after some tries. You have to redo the materials, which isn't really comfortable because scenes are imported as single object. If there were a good import module things would be different, but at the moment I tend to say it's more work that it's worth.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.