FlipBook is a 2D drawing and animation tool to use in a 3D environment.
It is inpired from Grease Pencil in Blender and Maya, and other 2D animation tools.
You can draw on 2D canvas or 3D object surfaces.
You can draw static or animated images, in different layers.
Known limitation : on versions prior to max 2022 update 2, the stylus pressure doesn't work in 3dsmax.