Carrara Fan Users Group on Yahoo
Renderosity Carrara Studio Forum
3DCommune Carrara Studio Forum
Other Plugins-
Driven, Piggypack, and more..
Multimorph, Potentializer, and Metamesh.
Anything Groove, Grows, Shader Ops, and too many more to list!
Architools, Baker, Deeper, and more.
Tree Druid, Thor, etc.