SUbD
Parametric quad-based subdivisions for SketchUp.
SUbD

SUbD is a parametric subdivision extension for SketchUp optimized for quad-based workflows.

Use free tools such as QuadFace Tools to create meshes with quad-topology and subdivide and crease with SUbD.

Visit the website for more details, examples, videos and manual. More example on the Facebook page.

Visit the SUbD forum on SketchUcation for example models and great cumminity assistance.

SUbD costs $40 - you can try it out for 30 days.