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


https://pymol.org/edu/?q=educational (PyMOL Download free version for educational purposes)


https://pymol.org/2/ (PyMOL full version, 30-days free trial)



                                         3)  Ucsf Chimera


https://www.cgl.ucsf.edu/chimera/