2dTiler- an interactive viewer for periodic tilings of all three two-dimensional geometries

2dTiler is an interactive viewer for periodic tilings of all three two-dimensional geometries, written by

Daniel Huson and Klaus Westphal. Input is a file of records, each describing a Delaney-Dress symbol,

a data-structure that prescribes the topology and symmetries of a periodic tiling, and output is the picture of that tiling. The geometric shape of the tiles and the specific symmetry group can be interactively modified.