RASMOL, vs 2.6, which runs under Windows (Win 3.1 Win95 or WinNT), MAC and UNIX is available from Edinburgh or from the RASMOL pages at UMASS, Amherst.
The University of California, Berkeley have created a modified version that can open several files and move molecules around independently.
If you don't see a rotating molecule of Viagra below this line
then you will need to install
a plug-in for Netscape or Internet
Explorer from Molecular Design Limited, Information Systems, Inc.
(MDL). MDL used over 10,000 lines from RASMOL in creating CHIME
and have provided a version free for academic and non-commercial
use.
If you do, then to change the settings, left click on the MDL
logo, or right click on the display to bring up the menu options.
Select to highlight the benzene ring. Select to revert to the original display.
If you are interested in the structures of proteins, then you should check out the excellent arrangement called Molecules R US for viewing files in the Brookhaven Protein Database.
Cn3D
is available from NIH and although it does not read a PDB (it
uses ASN.1 which is more compressed than PDB) it will write a PDB
as output. You will need to set your MIME type to
chemical/ncbi-asn1-binary.
Another source of PDB files is the
Department of Chemistry, Okanagan University College,
especially Natural Products.