BDT (Vaqué et al., 2006) helps with such tasks as: (a) using receptor flexibility during docking; (b) the automatic docking of a large library of ligands onto one or more receptors; and (c) docking a ligand library onto one or more receptors without defining one a priori ligand-binding site on them (the so-called "blind-docking" analysis) and using a short distance between grid points. BDT runs on top of four Fortran programs (i.e. make_grids, combine_grids, make_docks and analyze, one under each BDT window tab), which control the conditions of AutoGrid and AutoDock runs. BDT is available for free, upon request, for non-commercial research.