Structure Synth is described as 'cross-platform application for generating 3D structures by specifying a design grammar. Even simple systems may generate surprising and complex structures' and is an app in the Photos & Graphics category. There are more than 50 alternatives to Structure Synth for a variety of platforms, including Windows, Mac, Linux, iPad and iPhone. The best alternative is Blender, which is both free and Open Source. Other great apps like Structure Synth are Autodesk Maya (Paid), Autodesk 3ds Max (Paid), Cinema 4D (Paid) and Sketchfab (Freemium).
PLOPP is a creative painting tool for cartoon-like 3D scenes without the effort that comes with professional 3D modelling programs. You can build 3D objects very easily! Just paint them in a 2D environment and PLOPP will transform them into 3D!
form•Z jr, previously called bonZai3d, is an application with a fresh approach to 3D modeling aimed at delivering conceptual design and sketching ideas quickly while still making it possible to carry you to the next level of productivity.
General purpose 3D solids and surface modeler form•Z, the 3D form synthesizer, is above all a 3D modeling program, even though it also includes drafting, rendering and animation. Additional photorealistic rendering is offered by form•Z RenderZone Plus.
Realsoft 3D is a full-featured 3D software package with a relatively low price tag. Realsoft 3D is available for Windows, Linux, IRIX and Mac OS X. The most recent version 7 has only been released for Windows.
Artist3D is an extraordinarily easy-to-use 3D polygon modeling tool. It works completely without forms, pull-down menus, pop-up menus and text input. Only one modeling window covers each operation function. Less than 30 operation elements control the active interaction options.