Paint 3D, Blender, Sketchfab, Autodesk Maya, Autodesk 3ds Max, ZBrush, Autodesk Mudbox, 3D-Coat, Deep Paint 3D, picoCAD, BodyPaint 3D, Wings 3D, TrueSculpt, CrackArt, ShapeShop, Bforartists, Blacksmith3D-Paint, PloppSL are some alternatives to Curvy 3D.