| American Mineralogist Crystal Structure Database
... is an interface to a crystal structure database that includes every structure published in the American Mineralogist, The Canadian Mineralogist, European Journal of Mineralogy and Physics and Chemistry of Minerals, as well as selected datasests from other journals - [e] Cambridge Crystallographic Data Centre
CCDC is dedicated to the advancement of chemistry and crystallography for the public benefit through providing high-quality information services and software - [e] Cambridge Structural Database
... is the central focus of the CSD System, which also comprises software for database access, structure visualisation and data analysis, and structural knowledge bases derived from the CSD - [e] Crystal Lattice Structures
... offers a concise index of common crystal lattice structures - [e] Crystal structure database
... an interface to a crystal structure database that includes every structure published in the American Mineralogist, The Canadian Mineralogist, European Journal of Mineralogy etc. - [e] Crystallography Open Database
Upload data or search the database - [e] CRYSTMET
... contains chemical, crystallographic and bibliographic data together with associated comments regarding experimental details for each study. Toth Information Systems - [e] Group - Subgroup Relations of Space Groups
Lattice of Maximal Subgroups; Distribution of subgroups in conjugated classes; Coset decomposition for a group-subgroup pair; The splitting of the Wyckoff Positions; Minimal Supergroups of Space Groups; Supergroups of Space Groups; List of subgroups for a given k-index; List of supergroups for a given k-index; Common Subgroups of Space Groups; Common Supergroups of Two Space Groups. Bilbao Crystallographic Server - [e] Heavy Atom Databank
HAD. Information on the preparation and characterisation of HEAVY-ATOM derivatives of protein crystals - [e] Hermann Group
For a given group and supergroup the program HERMANN will give the representatives of the classes of conjugate subgroups based in a two step procedure through the Hermann group. Bilbao Crystallographic Server - [e] ICSD for WWW
Inorganic Crystal Structure Database. FIZ - [e] ICSDB
Incommensurate Structures Database. Bilbao Crystallographic Server - [e] Incommensurate Structures Database
LAMA - [e] International Centre for Diffraction Data
ICDD is a non-profit scientific organization dedicated to collecting, editing, publishing, and distributing powder diffraction data for the identification of crystalline materials - [e] NIST Neutron Crystallography Resources
... contains links to various documents and software of use for crystallography, particularly for use with the BT-1 neutron powder diffractometer at NIST - [e] PCOD
Predicted Crystallography Open Database - [e] Representation Theory Applications
Space Groups Representations; Direct Products of Space Group Irreducible Representations; Correlations Between Representations; Point Group Tables; Site-symmetry induced representations of Space Groups. Bilbao Crystallographic Server - [e] Solid State Theory Applications
Spectral Active Modes; Neutron Scattering Selection Rules; Primary and Secondary Modes for a Group; Pseudosymmetry Search in a Structure; Degree of Pseudosymmetry Estimation; Pseudosymmetry Search with KPLOT; Transition Paths. Bilbao Crystallographic Server - [e] Space Groups Retrieval Tools
Generators and General Positions of Space Groups; Wyckoff Positions of Space Groups; Reflection conditions of Space Groups; Maximal Subgroups of Space Groups; Series of Maximal Isomorphic Subgroups of Space Groups; Equivalent Sets of Wyckoff Positions; Normalizers of Space Groups; The k-vector types and Brillouin zones of Space Groups. Bilbao Crystallographic Server - [e] SPDP Database
Structure Determination from Powder Diffraction Database - [e] Structure Utilities
Transform Unit Cells; Strain Tensor Calculation; Assignment of Wyckoff Positions; Alternative Settings for a given Crystal Structure; Equivalent Descriptions for a given Crystal Structure. Bilbao Crystallographic Server - [e] Subperiodic Groups: Layer, Rod and Frieze Groups Retrieval Tools
Generators and General Positions of Subperiodic Groups; Wyckoff Positions of Subperiodic Groups; Maximal Subgroups of Subperiodic Groups. Bilbao Crystallographic Server - [e] | 
