Clones of SketchUp

Wanted: SketchUp clone2 days on the list, still without a clone

What it must meet

Name SketchUp.
Declare to be its clone or replacement.
Open its files (.skp).
Look and feel like SketchUp when in use.

Other 3D & CAD apps

3ds Max AutoCAD Cinema 4D Civil 3D Fusion Inventor Maya Revit Rhino SolidWorks Substance 3D Painter ZBrush