Mercury is a freeware developed by the Cambridge Crystallographic Data Centre, originally designed as a crystal structure visualization tool.

[2] The Cambridge Crystallographic Data Centre (CCDC) developed and launched two programs, named ConQuest and Mercury[3] that run under Windows and various types of Unix, including Linux.

The primary objective of the first generation Mercury is to provide the three dimensional viewing of crystal structures with .MOL2, .PDB, .CIF, .MOL file formats.

[5] Mercury 2.0 launched in 2008, with additional tools to interpret and compare packing trends in crystal structures.

Cambridge Crystallographic Data Centre (CCDC) provides CSD licence to academic institutions.