1)   PDB databases

https://www.wwpdb.org


-          https://www.rcsb.org  ( RSCB PDB)

-          https://www.ebi.ac.uk/pdbe/   (PDB Europe)

-          https://pdbj.org  (PDB Japan)


http://www.ebi.ac.uk/pdbe/emdb/ (The Electron Microscopy Data Bank)





PDB file format documentation:


http://www.wwpdb.org/documentation/file-format




                                            2)   PyMOL


https://pymol.org/2/  (official website)

https://pymolwiki.org/index.php/Main_Page  (support site for PyMOL)