SUbD

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

Use free tools such as QuadFace Tools (https://extensions.sketchup.com/en/content/quadface-tools) to create meshes with quad-topology and subdivide and crease with SUbD.

Visit the website (http://evilsoftwareempire.com/subd/subdividing) for more details, examples, videos and manual. More example on the Facebook page. (https://www.facebook.com/SUbD4SketchUp/)

Visit the SUbD forum on SketchUcation (https://sketchucation.com/forums/viewforum.php?f=397) for example models and great community assistance.