Set the width, height and depth of a bookcase, wardrobe, kitchen unit or storage bench in millimetres, choose a material, and watch the piece take shape in 3D. Every change updates the price and the cutting list at the same time, so what you see is what a workshop would cut.
No account is needed to design, preview or export. An account only matters if you want to save a design or publish it to the gallery.
Prefer to start from something finished? The gallery has designs you can open and change, and how it works explains the pipeline from a design to a machined cutting list.