http://3d-kstudio.com/product/curlipse-3ds-max-shape-object/

3Ds Max plugin for creating shape objects like open/closed flat or 3D elliptical or circular spline helixes.
Also, using Curlipse, you can create N-gon shapes with a lot of options.
Unlike the standard helix shape, Kstudio plugin generates a valid curved shape with the ability to specify interpolation steps.