Rhinoceros is described as 'Rhino can create, edit, analyze, document, render, animate, and translate NURBS* curves, surfaces, and solids, point clouds, and polygon meshes. There are no limits on complexity, degree, or size beyond those of your hardware' and is a 3D Modeler in the photos & graphics category. There are more than 50 alternatives to Rhinoceros for a variety of platforms, including Windows, Mac, Linux, Web-based and iPad apps. The best Rhinoceros alternative is Blender, which is both free and Open Source. Other great apps like Rhinoceros are FreeCAD, SketchUp, SOLIDWORKS and Autodesk 3ds Max.
MoI’s sleek intuitive UI blends a fluid easy workflow with powerful tools, making it the perfect choice for someone who has been frustrated with the complexity of existing CAD tools.
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.
Unifies product concepting, modeling, and surface refinement with subdivisional modeling, automated mesh surfacing, algorithmic tools, immersive VR design, assembly management, VRED integration, and seamless collaboration across disciplines in a single design pipeline.
Formerly Vellum Solids, Xenon™ is an associative 3D modeling software for product design and development that's easy to use. It offers history-based wireframe, solid and surface modeling with precision drawings, renderings and animation.
Cobalt is a parametric 3D modeling software for product design and development that's easy to use. It offers wireframe, solid and surface modeling with precision drawings, renderings and animation.
Sverchok is a parametric tool for architects and designers. You can use it to program objects' shapes without knowing any programming languages.
RhinoDiamond is software created by jewellers for 3D jewellery design using functions that reflect the needs of goldsmiths.
With an advanced clay engine and artist-tested tools, Sculptura is the most intuitive and powerful 3D sculpting app ever designed for your iPad. Sculpt engaging characters, ghastly monsters, or even intriguing abstract art anywhere you are.
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.
JCD is a powerful and robust jewelry design solution. Built on the ZW3D engine, it has a dynamic history, extensive jewelry tools and expanding component library. It further incorporates the Thea rendering engine to produce ultra-realistic images.
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MoI uses the same 3dm file as rhino and NURBS design. The UI is easier to navigate so you do not have to spend ages looking for the right command, moreover it can be easily customized. You can add shortcuts and run scripts if you need additional features and use the forum to get any help you might need. I used rhino since version 2.0 but prefer Moi because is more design focused. It does not have an internal render engine, but there are plenty available nowadays.