I've used this one - https://jonathan.overholt.org/projects/cutlist - in that past but it's only for Linear material.
After referring to Mr Google I found this one - http://workshop-buddy.com/index.html
It's simple, which is exactly what I need. I have no affiliation to it whatsoever. I did a search on SMC and was unable to find any reference to it.
Has anyone used it before?
Just thought I'd share. Happy New Year!
Sincerely, Dave.