Some useful links

NIST Physics Laboratory
Crystallography World Wide
International Union of Crystallography (IUCr)
Commission on Powder Diffraction (CPD) of the IUCr
SINCRIS Crystallographic Software
Collaborative Computational Project No. 14 (Lachlan Cranswick) (CCP14)
ILL's Diffraction Group (Alan Hewat)
Armel Le Bail's Pages (University of Le Mans)
Brian Toby's Pages
(NIST Center for Neutron Research)
International Centre for Diffraction Data (ICDD)
Certified Scientific Software (SPEC)
American Institute of Physics (AIP)
Materials Research Society (MRS)
Rudjer Boskovic Institute (Croatia) Rudjer Boskovic (1711-1787)