Center for X-Ray Crystallography, University of Florida
Crystal Structure Visualization Software for various platforms
Information Server for Crystallography - International Union of Crystallography
Site has links to software sites and also to crystallography organizations,
Home page: http://www.olex2.org/
Download link: http://www.olex2.org/download/
PLATON is available for various platforms from this site. Explanations
and manuals are included here.