openNURBS is described as 'The openNURBS Initiative provides CAD, CAM, CAE, and computer graphics software developers the tools to accurately transfer 3-D geometry between applications' and is an app in the Development category. There are three alternatives to openNURBS for Linux and Windows. The best alternative is libnurbs, which is both free and Open Source. Other great apps like openNURBS are NURBS++ (Free, Open Source) and SISL (Free, Open Source).
Non-Uniform Rational B-Splines (NURBS) curves and surface are parametric functions which can represent any type of curves or surfaces. This C++ library hides the basic mathematics of NURBS. This allows the user to focus on the more challenging parts of their projects.