Software to generate x-ray diffraction pattern

Hello all,

 Does anyone know any software that can generate x-ray diffraction pattern for polymer? I used to have Cerius2 which can do the job very well, but unfortunately the license expired some months ago and I am looking for some alternative software that can do similar job. Right now I have all the structures saved in .msi format. Any suggestions would be appreciated, thanks a lot!

Chuang Deng