I am designing a stamp matrix. There is a reason why I do it myself rather than just order from some design company. The shape is fine but regular, though quite different in different parts of the matrix. A simple approach is to write a script in Python defining the shape of each of the matrix parts. This task is much simpler with a good library. I looked around using Google for few days, turned down all found candidates, and started to write my own. After a week or so of leisure development, it has more complete set of features than any of those rejected candidates.
Meanwhile I continued looking for alternatives. Yesterday, I found that FreeCAD might be, actually, a good enough tool for the whole problem. Moreover, recently a porting to my OS effort was started. I tested the proposed port, and found that it works. So, at the moment it looks like I do not need to continue with the library. Just for a case, I decided to store it on SourceForge.