CheetahSTC

cheetahSTC takes CAD integration one step further than just plugging in a program to make a mesh on a fixed surface geometry. Instead it creates a new higher order mesh definition, the Cell3 that is
operated on as CAD geometry. This definition, the Cell3 is a 3D iso
parametric definition of space, it's a true Solids definition with iso
parametrics in 3 dimensions as opposed to a Brep which is only a
boundary surface representation and limited to 2 iso parametric
dimensions. cheetahSTC creates these Cell3 and manipulates the
models with CAD functionality, whilst maintaining full STC compliance;
meaning this is unbreakable parametric CAD.

http://www.moceon.com/