Diffraction Database

Inorganic Crystal Structure Database (ICSD)  https://icsd.products.fiz-karlsruhe.de/en/products/icsd-products

Cambridge Structural Database (CSD) https://www.ccdc.cam.ac.uk/solutions/csd-core/components/csd/

The CSD for small-molecule organic and metal-organic crystal structures.

Crystallography Open Database (COD) http://www.crystallography.net/cod/

International Center for Diffraction Data (ICDD) https://www.icdd.com/

Bilbao Crystallographic Server  https://www.cryst.ehu.es/

Programs and database for symmetry and representation analysis of crystal and magnetic structures

RCSB Protein Data Bank (PDB)  https://www.rcsb.org/

The Protein Data Bank provides archive-information about the 3D shapes of proteins, nucleic acids, and complex assemblies

Worldwide Protein Data Bank (wwPDB) http://www.wwpdb.org/

Mineralogy Database http://webmineral.com/

American Mineralogist Crystal Structure Database http://rruff.geo.arizona.edu/AMS/amcsd.php