(eng): Free material design deals with the question of finding the stiffest structure with respect to one or more given loads which can be made when both the distribution of material as the material itself can be freely varied. We present the single and multiple-load situation. We further introduce a software tool Moped for free material optimization of general two-dimensional bodies. The graphical post-processor of Moped is tailored for a design of fibre-reinforced composite materials.