Hi Barry,
Thanks for the info. Indeed, it is a very nice script. I tried several times to make a circle packing node, but I always ended up filling a simple rectangular or circular base shape. (Filling arbitrary shapes involves hard calculations.) I never thought that packing arbitrary shapes could be done with the help of the tools inside MoI (boolean intersection).

A cool script will be fall any objects in a box for obtain o sort of packing objects without intersection!

Hi PaQ
NodeEditor Plus includes a circle packing node that can be useful for arbitrary shapes, especially shapes with holes. The node called "Image Circles" was developed by Wayne Hill. It uses an image to generate a circle packing pattern.
Here, I've just imported your screenshot into Gimp and used "Fuzzy Select" and "Bucket Fill" tools to make a PNG image with a transparent background.
Load the image into "Image Circles" by clicking on the node's white area and change the settings. Then connect this node to an "Output" node and press the Run button to get the desired result.
If you want to keep the results, press the Apply button.

Tip: Double click on the canvas to open the search box.

Ho that's very interesting.
Thanks for posting, I definitively need to check that out, it's probably way smarter than my method !