Epspline (as in Edit-Povray-SPLINE) is a utility for POV-Ray users.
Epspline is a simple 2D graphical editor for POV-Ray lathe and prism objects. This release is enhanced with one new feature. It is now possible to place a background image in the drawing area. Hopefully this will help in tracing. A background image is set up through a dialog box. The dialog also provides a small number of image adjustments so that the image may be placed in the drawing area in a useful way. The documentation has a new section describing this new feature which may be invoked by a help button in the dialog box. The dialog box is invoked from the Tools menu.
You can download the new version, and see a few samples here.