Try the new FullControl now! Go to www.fullcontrol.xyz to test online GCode generation. It requires no knowledge of FullControl, no installation of anything - easy! The new version of FullControl (written in python) is being used on that website. The python code will be released free and open source in the next few weeks.
Unconstrained design for additive manufacturing
FullControl GCode Designer is open source software
It is available for free download from GibHub