I have made available several computer programs that I have written over the last few years, which I hope you will find useful. These are the following:

VIBRATE! A program to compute irreducible representations for any crystal structure

ChainPlot To demonstrate the motion of atoms on a linear 1-dimensional chain

LD To demonstrate the motion of atoms in a 2-dimensional array

FOURIER To demonstrate Fourier synthesis as used in crystallography

MEGAW A program to compute the effect of octahedral tilting in perovskite crystals.

WinDicVol A GUI interface to the DICVOL91 powder autoindexing program

WinOptact Calculation of optical rotation and birefringence from crystal structure