Java applet version of Jmol which allows Jmol to be embedded in web pages (given that viewers have a Java plugin installed). Like with the application, Scripting is available. For some demonstration pages see http://www.jmol.org/demo/. To see the HTML source use your web browser View → Page Source.
Additionally, Jmol can also be installed locally, e.g. on the hard disk or on CD. See Jmol Applet Deployment Local.
Jmol in Wikis
Unsigned vs. Signed Applet & Data Access
The signed applet can load a molecular model from any http or ftp URL. However, the user will be asked to trust the signed applet. This could be problematic since the publishing authority (jmol.org) "cannot be verified", and the security certificate was issued by a group that is "not trusted" (jmol.org). This is because it would be costly and cumbersome for each version of the applet to be signed by a trusted (commercial) authority.
The unsigned applet displays the molecule without asking the user to trust it. However, it is limited (for security reasons) to loading molecular models from the same http domain (server) that downloads the applet itself. FirstGlance in Jmol uses the unsigned applet by default, but the signed applet will be used when that "Advanced Option" is checked. Thus you can easily see both applets in action. Methods for accessing data files from arbitrary servers are described in some detail at PDB Data File Access Methods.