123D is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best Linux alternative is Blender, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to 123D and many of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to 123D are FreeCAD (Free, Open Source), MakeHuman (Free, Open Source), Autodesk Maya (Paid) and Wings 3D (Free, Open Source).
MakeHuman is an interactive modelling tool for creating realistic 3D human characters. These models can be exported to several computer graphics and animation platforms including Blender, Unity 3D, Unreal Engine, OpenSim and Second Life.
Wings 3D is a subdivision modeler inspired by Nendo and Mirai from Izware. It is possible to assign materials, vertex color, UV coordinates and textures, but there will be improvements in those features before Wings goes 1.0.
Houdini covers all the major areas of 3D production, including: * Modeling - All standard geometry entities including Polygons, (Hierarchical) NURBs/Bezier Curves/Patches & Trims, Metaballs * Animation - Keyframed animation and raw channel manipulation (CHOPs), motion...