The P2D2 (Predicted Powder Diffraction Database) contains the powder diffraction patterns calculated from these structure candidates, allowing for search-matching.
The PCOD [1] (virtual compounds), a subset of COD [2] (real compounds), contains CIFs of inorganic structure candidates from mainly two sources (computer programs) : ZEFSA-II and GRINSP.
[1] A. Le Bail (2005). “Inorganic structure prediction with GRINSP,”
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Appl. Crystallogr. 38, 389–395.
[2] S. Gražulis, D. Chateigner, R.T. Downs, A.F.T. Yokochi, M.
Quirós, L. Lutterotti, E. Manakova, J. Butkus, P. Moeck and A. Le
Bail (2009). "Crystallography Open Database – an open access collection
of crystal structures," J. Appl. Crystallogr. 42, 726-729.