Jmol filter

Jmol is open-source Java software for interactive 3D viewing of molecular structures. It can easily be embedded into a webpage... including a Moodle page.

The Jmol Moodle filter is recently developed but comes as a single download and is easy to use and install.

http://moodle.org/file.php/5/moddata/forum/323/170717/jmol-quiz-example.png

It requires no additional capability on your web server, but is a Java applet, added to the page with JavaScript controls, so requires both Java and a JavaScript-enabled browser for the user.