Here's a proposal for drawing and scribbling notes in GNU Emacs.
*Features:*

   - Draw simple shapes and text
   - Scribble freehand
   - Visual selection using mouse
   - Zoom
   - Undo/delete selection
   - Erase

*Code: https://gitlab.com/atamariya/emacs/-/blob/dev/lisp/svg.el
<https://gitlab.com/atamariya/emacs/-/blob/dev/lisp/svg.el>*
*Screenshots:*
https://lifeofpenguin.blogspot.com/2021/08/scribble-notes-in-gnu-emacs.html
*Video:* https://youtu.be/oj2OR5ytHx

I have few questions:
- Can this be included in Emacs core?
- I've copied two functions from Lars (
https://github.com/larsmagne/ewp/blob/master/ewp.el ). How should
attribution work in this case?

Additionally, following are mandatory patches for svg.el:
- polyline point uses CSV pairs separated by space.
- id should ideally be unique. This will allow changing element type when
different element with same id is added.
- If value is nil, don't include the attribute in the print output.