What are some alternatives?
When comparing PathEngine and Aartform Curvy 3D, you can also consider the following products
SelfCAD - SelfCAD is an online 3D modeling and slicing software.
EQUINOX-3D - EQUINOX-3D offers 3D modeling, animation, photorealistic rendering, photorealistic VR content creation, CAD/CAM, 3D printing, laser-cutting and more.
MilkShape 3D - The MilkShape 3D website has been down for almost one week.
Strata Foto 3D CX - Strata Foto 3D CX lets user use a digital camera or any phone camera to capture real-world objects as fully textured 3D models.
Clara.io - Free online 3D modeling software: Design, editor, animation, rendering, & lots of free 3D models. Supports Three.JS, Blend, FBX, OBJ, V-Ray, Babylon.JS, STL.
Wings 3D - Wings 3D is a subdivision modeler inspired by Nendo and Mirai from Izware.