I found this very sophisticated Draw application created entirely with the Wolfram Language:
https://github.com/shdlbwr/draw
The documentation is available here:
http://community.wolfram.com/groups/-/m/t/963158
When I execute Draw[]
I get the following warning, although I am using Mathematica 11.0.1:
When I create a drawing, save it as a notebook file and execute this file nothing happens, no drawing is seen.
Do you have experience with this application? How can I save drawings e.g. in png format?