Quantity   Component name
1 × Digital calipers (for measuring things)
1 × Camera (for taking pictures)
1 × A quarter For scale
1 × GIMP (open source image manipulation software) https://www.gimp.org
1 × Inkscape (open source scalable vector graphics software) https://inkscape.org/
1 × OpenSCAD (open source solid CAD software) http://www.openscad.org