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.