123D is described as 'Autodesk 123D is a suite of hobbyist CAD and modelling tools created by Autodesk' and is an app in the Photos & Graphics category. There are more than 50 alternatives to 123D for a variety of platforms, including Windows, Mac, Linux, the Web and Android. The best alternative is Blender, which is both free and Open Source. Other great apps like 123D are FreeCAD (Free, Open Source), SketchUp (Freemium), MakeHuman (Free, Open Source) and Autodesk Maya (Paid).
- Rhino can create, edit, analyze, document, render, animate, and translate NURBS* curves, surfaces, and solids, point clouds, and polygon meshes. There are no limits on complexity, degree, or size beyond those of your hardware. View 56 alternatives to RhinocerosNo screenshots yet
- K-3D is free-as-in-freedom 3D modeling and animation software. View 51 alternatives to K-3D
According to the official website k-3d.org :
The latest "source code" release is from November 2015. And the latest binary executable release is even older. According to its Sourceforge page ( https://sourceforge.net/projects/k3d/files/K-3D Win32 Binaries/ ), latest release is from june 2010.
- Free • Open Source