NijiGPen is a free Blender add-on that I am developing to add Grease Pencil features for 2D graphic design & illustration. This video shows some recent updat...

I personally find this addon quite innovative. To me it looks like a 2d drawing toolset inside of 3d program that is more powerful and has unique 2d drawing features absent in actual state-of-art 2d drawing programs like CSP and Krita!