Angola is right of course, Renderosity itself is testament to just how inventive people can be with a limited program. Talk about pushing the envelope. I feel it requires a few extras to make the very best of it. Another free program I would recommend is Anim8or, which is excellent for editing morphs and creating props. Also within Poser you can edit props and characters with magnets to reshape them. I echo Momcats recommendation of PSP, in the UK it has just halved in price.