Clones of Inventor

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

What it must meet

Name Inventor.
Declare to be its clone or replacement.
Open its files (.ipt, .iam).
Look and feel like Inventor when in use.

From the same maker, already have a clone

AutoCAD, 2 clones

Other 3D & CAD apps

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