Virtual whiteboard for sketching hand-drawn like diagrams
HTML5 canvas based smooth signature drawing
Drawing, graphics conversion, software development, administration.
very good CAD software
Illus is a minimal drawing program based on Python and Tkinter.
A hybrid graphics editor and programming environment
Madeline 2.0 Pedigree Drawing Engine (PDE)
dedalo is a 2d cad drawing software written in python3.
Vector based drawing software designed for RPGs