- Bilbao Crystallographic Server
- AFLOW on-line the great Curtarolo site! Also see the arXiv paper: The AFLOW Library of Crystallographic Prototypes.
- Crystallography Open Database
- The American Mineralogist Crystal Structure Database)
- International Tables for Crystallography available online
- A Hypertext Book of Crystallographic Space Group Diagrams and Tables
- ISOTROPY Software Suite: The ISOTROPY software suite is a collection of software which applies group theoretical methods to the analysis of phase transitions in crystalline solids.
- TubeGen Online – Web-Accessible Nanotube Structure Generator. TubeGen was developed with the financial support of the National Science Foundation and is made available by the Doren Research Group, Department of Chemistry & Biochemistry at the University of Delaware.