The Grease Pencil provides 2d animation tools within Blender's free and open-source full-3d pipeline.

CAD Sketcher lets the user make a ‘sketch’, a 2D drawing. They then constrain it, saying “this line is vertical, that line is parallel to this one”, until the sketch is fully defined.

Grease Pencil tool for drawing in a 3D space Make 2D animations in a 3D space Grease Pencil is a tool found within Blender that’s made to let you draw within the 3D project.