NUPARM-Plus is a program to analyze and characterize overall geometry of input double stranded helices. This program can be very useful in understanding sequence directed structural variations in nucleic acids. It can also be used in the modeling of nucleic acid helices, analysis of molecular dynamic trajectories of structures containing double stranded helices etc. This web server version of NUPARM-Plus uses JSMol (JmolApplet) to display the double stranded helices along with their axis, in the same orientation as that in the input pdb file.