  DNA origami is an interdisciplinary area where DNA can be used as a building
block for making useful stuff at nanoscale. This work presents an open source
software DNA pen (based on the recent work of Peng Yin and his group) which can
be used (using free hand and digital molecular canvas) to draw an object at
nanoscale. Software generates error free DNA sequences which can be used in the
wet lab to create the object at the nanoscale. Using DNA pen we have drawn
several objects including the map of India and sanskrit letter "Om" from free
hand molecular canvas and digital letter DNA using digitized molecular canvas.
