Art of Illusion is a free, open source 3D modelling and rendering studio. (GPL)
ICADMac is user friendly 2D/3D CAD software for MAC OS X, which reads and writes DWG format drawing files up to AutoCAD v. 2019.It is easy to use thanks to the high level of compatibility with AutoCAD, and it is easy to get as you pay far less money to obtain economic licensing solutions.
Multiple Snapshots with AutoProtect, Improved Unity, DirectX 9.0 Shader Model 2 3D, and support for Mac OS X Server guests. 2.0.1 November 14, 2008 Various bug fixes. 2.0.2 February 11, 2009 Import from Parallels, supports Mac OS X Server 10.5.6 host, mounts DMG images, supports Ubuntu 8.10 in Unity mode. 2.0.3 April 2, 2009 Various bug fixes. SmartDraw (Best 2D CAD For Mac) If you’re looking for something powerful for 2D CAD design but. We also support these products via Boot Camp, part of Mac OS X that lets you install and run Windows (and Windows-based applications) on a Mac. Inventor for Mac Professional-grade product design and engineering tools for 3D mechanical design, simulation, visualization, and documentation. MatrixWorld 3D for Mac OS X Screensaver - Did you ever see The Matrix movie? Hope, no further comments needed. Just transfer yourself into the Matrix World.
Cross-platform
Blender
Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline—modeling, rigging, animation, simulation, rendering, compositing and motion tracking, even video editing and game creation. (GPL)
Linux - FreeBSD - Windows - MAC OS X
FreeCAD
FreeCAD is a general purpose feature-based, parametric 3D modeler for CAD, MCAD, CAx, CAE and PLM, aimed directly at mechanical engineering and product design but also fits a wider range of uses in engineering, such as architecture. (GPL)
Windows - Linux - MAC OS X
LeoCAD
LeoCAD is a CAD program for creating virtual LEGO models. It has an easy to use interface and currently includes over 6000 different pieces created by the LDraw community. (GPL)
Linux - Windows - MAC OS X
LibreCAD
LibreCAD is a free Open Source personal CAD application for Windows, Macintosh and Linux. Support and documentation is free from a large, dedicated worldwide community of users, contributors and developers. It's available in more than 20 languages. (GPL)
Linux - Windows - MAC OS X
MeshLab
MeshLab is an open source, portable, and extensible system for the processing and editing of unstructured 3D triangular meshes. (GPL)
Linux - FreeBSD - Windows - MAC OS X
Pixie
Pixie is an open source RenderMan renderer for generating photorealistic images. (LGPL)
Linux - FreeBSD - Windows - MAC OS X
QCAD
QCAD is a free, open source application for computer aided drafting (CAD) in two dimensions (2D). With QCAD you can create technical drawings such as plans for buildings, interiors, mechanical parts or schematics and diagrams. (GPL)
Windows - MAC OS X - Linux
Sweet Home 3D
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Sweet Home 3D is a free interior design application that helps you place your furniture on a house 2D plan, with a 3D preview. The program is aimed at people who want to redesign their interior quickly. (GPL)
Cross-platform
Wings 3D
Wings 3D is a subdivision modeler inspired by Nendo and Mirai from Izware. (BSD)