Big 3DCG community. Users who has experience distributes variable 3d items. Many free 3D items available, too.
A company distributes high quality 3d model such as Aiko,Victoria and so on. There are DAZ STUDIO(can make pose and render them) , Carrara( low price but high function 3DCG software). Register to get high quality free items(but, these distributes only limited time )
This is a maket place for 3d items by Smith micro(poser distributer) You can get many free items if you regist.
There are free CG arts, 3d models, photographs, animations and so on. over 9000 poser free items are available.