Unfortunately though that would be a useful product to have (both in terms of saving the download time and archiving things before they disappear from the net), I don't think it could be produced. Renderosity would have to have a (non-exlcusive) right to distribute the contribution on a commercial product. There are a huge number of entries in the Free Stuff, and not one of them has any clear indication of its copyright status in a central, easy to locate place. Many have readmes, but the amount of work for someone to download each contribution, read through it to see what rights are granted, email the creator if it is unclear, check if it contains any copyrighted Zygote meshes (yes, some of the Freestuff items contain a copy of Poser OBJ files), and so on would likely be prohibitive.