IUCr, or the International Union of Crystallography, is a leading brand in the field of crystallography. They provide a wide range of products and services to researchers and scientists around the world. One of their key offerings is the World Directory of Crystallographers (WDC), a comprehensive database that provides contact details and scientific interests of active crystallographic researchers.

Originally conceived as an organizational tool, the WDC has evolved into a valuable resource for facilitating international contacts and building a global community of crystallographers. In addition to the WDC, IUCr also offers various resources and publications. They have a collection of journals, including Acta A, B, C, D, E, F, and IUCrJ, that cover different aspects of crystallography.

They also publish International Tables, a valuable reference for crystallographers. IUCr is committed to promoting crystallography through education and outreach programs. They organize meetings, workshops, and conferences to foster collaboration and knowledge sharing.

They also offer teaching resources and initiatives to support crystallography education. With a rich history dating back to 1948, IUCr continues to be at the forefront of advancing crystallographic research and fostering scientific collaboration