*[http://nanocrystallography.research.pdx.edu/search/edu/ Educational Subset of the Crystallography Open Database (EDU-COD)] (specialization: crystal and molecule structures for college education, access: free, size: medium)
*[https://web.archive.org/web/20070403082355/http://xpdb.nist.gov:8060/BMCD4/ Biological Macromolecule Crystallization Database (BMCD)] (specialization: crystallization of biological macromolecules, access: free, size: medium)
*[http://nanocrystallography.research.pdx.edu/search/cmd/ Crystal Morphology Database (CMD)] (specialization: morphology of crystals, access: free, size: very small)
*[http://www.hypotheticalzeolites.net/DATABASE/DEEM_REFINED/ Database of Hypothetical Structures]  (specialization: predicted zeolite-like crystal structures, access: free, size: large)
*[http://www.iza-structure.org/databases/ Database of Zeolite Structures] (specialization: crystal structures of zeolites, access: free, size: small)
*[http://hmofs.northwestern.edu/hc/crystals.php Hypothetical MOFs Database]  (specialization: predicted metal-organic framework crystal structures, access: free, size: large)
*[http://www.cryst.ehu.es/icsdb/index.html Incommensurate Structures Database] (specialization: incommensurate structures, access: free, size: small)
*[https://web.archive.org/web/20130515052529/http://www.cinam.univ-mrs.fr/mpcd/ Marseille Protein Crystallization Database (MPCD)] (specialization: crystallization of biological macromolecules, access: free, size: medium)
*[https://web.archive.org/web/20120806204613/http://helios.princeton.edu/mofomics/ MOFomics] (specialization: pore structures of metal-organic frameworks, access: free, size: medium)
*[http://nanocrystallography.research.pdx.edu/search/ncd/ Nano-Crystallography Database (NCD)] (specialization: crystal structures of nanometer sized crystallites, access: free, size: small)
*[https://web.archive.org/web/20120112115407/http://www.nist.gov/srd/nist42.cfm NIST Surface Structure Database] (specialization: surface and interface structures, access: restricted, size: small-medium)
*[http://cod.ibt.lt/pcod/index.html Predicted Crystallography Open Database (PCOD)] (spezialization: predicted crystal structures of organics, metal-organics, metals, alloys, intermetallics, and inorganics, access: free, size: very large)
*[http://www.crystallography.net/tcod/ Theoretical Crystallography Open Database (TCOD)] (spezialization: crystal structures of organics, metal-organics, metals, alloys, intermetallics, and inorganics that were refined or predicted from density functional theory with some experimental input, access: free, size: small)
*[https://web.archive.org/web/20140524081408/http://helios.princeton.edu/zeomics/ ZEOMICS] (specialization: pore structures of zeolites, access: free, size: small)