Online tools 

Determining the underlying topology of your crystal structure
Upload CIF file and get the topological type of your crystal structure for free.

Search for underlying topologies and their occurrences in crystal structures
This service provides free access to the actual TTD and TTO collections. You may get references to all crystal structures with a particular underlying topology and all topological representations and their topologies for a particular crystal structure.
Version 1.1 beta (Release date: 15 December 2017)

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