Putty3D - SCULPT ANYTIME, ANYWHERE
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Sculptris - Sculptris: Enter a world of digital art without barriers.
forger - forger is a digital sculpting application for the artist who wants to be able to sculpt anywhere.
Sketchfab - Sketchfab is an industrial design software tool is useful for ideation and for beginners in the industrial design field.
CAD Exchanger - View, explore and convert 3D CAD data on desktop, web and mobile. Read and write Solidworks, STEP, JT, STL and 30 other 3D formats. Applications for end-users. SDK's and tools for software developers. Custom development services for businesses.