3DMolSym

3DMolSym
http://www.molwave.com/software/3dmolsym/3dmolsym.htm
3DMolSym is an educational program designed to visualize the symmetry elements of molecules and to animate the corresponding symmetry operations in an interactive 3D environment.

HCI things I like

• The rotate controls update a small icon to show the axis around which it rotate
• Animation usage to explain symmetry
• Captured view with a simple click (the button then becomes the view selection button)
• The technology: it is a Shockwave web application.
• The usage of transparent elements to show movement, symmetry planes
  

What I do not like

• Captured view has a reset button that does not do the intuitive thing i.e. resetting the saved view.
• The small view for panning on the left is a duplicate of the main window useful only because the main window has no pan method (e.g. the three mouse button function for rotate/zoom/pan)