So, here it is:
https://github.com/Sincra/NWN_WSP_Calcu ... ag/Release
Please keep in mind this is a Java stand alone executable, you will likely need the Java Runtime Environment for your machine.
Check the Readme text file for a link to the download page.
Please do not redistribute this without my permission, It has gone through alot of iterations and I would be rather upset to find that to be the case.

Some preview images:

