Cool 3d organic modeller
Found a cool 3D organic modeller. The best thing is that it is free.
This software is known as Shapeshop. It is not the most accurate of modellers…but it is almost like modelling with clay. .. and it is fun. I have only been play around with it for a while, so I can get much of a review. Nevertheless, it is quite easy to play around with.

Your can get the software here.
This software is however not good for building geometrical structures such as an oil rig 3D model.