The best free alternative to Rhinoceros is Blender, which is also Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Rhinoceros and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Rhinoceros are FreeCAD, Autodesk Fusion, Shapr3D and Bforartists.
A comprehensive open-source 3D software suite for modeling, UV unwrapping, texturing, rigging, and animating. It supports renderings, simulations including fluid and cloth dynamics, complex compositing, video editing, and Python scripting, running across all major operating systems.
A powerful open-source parametric 3D modeler ideal for mechanical engineering, supporting Python scripting, running on Windows, Linux, and Mac, with modular architecture allowing extensive adaptability and use with scientific computing libraries.
Integrated CAD, CAM, and CAE suite offering cloud modeling, simulation, and manufacturing tools with collaborative editing, free-form and parametric design, licensing for students, hobbyists, and startups, plus support for 3D printing and CNC machining.
From design to manufacturing. Teams collaborate with more impact. Instinctive design meets multidevice capability and full interoperability for the ultimate 3D design workflow.
Bforartists is a complete 3D suite to create 3D content. It offers you the full 3D art pipeline to create game graphics, prerendered movies and stills.
Vectary is the most accessible 3D and Augmented Reality design platform. Create an account for free online. No app download needed. Build immersive experiences for the real world. Publish 3D and Augmented Reality content to any website.
CAD Sketcher is a free and open-source project looking to enhance precision workflows in Blender by bringing CAD like tools, features and usability to Blender.
Sverchok is a parametric tool for architects and designers. You can use it to program objects' shapes without knowing any programming languages.
ZModeler (or Zanoza Modeler) is a 3D modeling application. It is aimed at modelers who model for computer games such as 18 Wheels of Steel, Grand Theft Auto, Need for Speed, Midtown Madness or similar video games.
K-3D is free-as-in-freedom 3D modeling and animation software. It features a plugin-oriented procedural engine for all of its content, making K-3D a very versatile and powerful package.
Compatibility DLL for running Blender 3.x on Windows 7 and a patch to modify the Blender source to use it.
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Can't stop laughing. As NURBS was the main concern ("don't use for real life" posted anypoop) and is now fully integrated, what else but snobbery could keep easy-payers wasting money on a proprietary software?