Well you can almost use every 3d creation suite, a great free example would be blender (free and opensource). You can export your models to obj or glTF file and import them in our SDK and move the positions for example.
We will write more about this later on, but we want to create it as easy as possible i think a wordpress for VR idea.
VRChat is super popular and I think at least partly because of the ability for users to create and import their own models. So if users can do the same in CosmosCR then that would be a promising feature.
This would be great if CosmosCR would offer a simple tool for creating models and personalize it. That would enable people to connect to the community even more and not get bored so fast.