Blender - Blender is the open source, cross platform suite of tools for 3D creation.
BricsCAD - A powerful CAD platform, with features familiar to you from native .dwg applications.
Sculptris - Sculptris: Enter a world of digital art without barriers.
iCADMac - User friendly 2D/3D CAD software for MAC OS X, which reads and writes DWG format drawing files.
Sketchfab - Sketchfab is an industrial design software tool is useful for ideation and for beginners in the industrial design field.
AutoCAD LT - AutoCAD LT is a drafting tool to create 2D drawings.