And don't miss this free true Gem for the technical aspects! :) (maybe a little more complex than Moi! ;)
http://www.polycad.co.uk
(ps I have made the French translation! Maybe my biggest! :D
http://moiscript.weebly.com/polycad.html

Damned seen that he has made new things since 2 years!
I will update the next year! :)