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The Molecular Symmetry Online website offers a set of tools for 3D interactive display of molecules and their symmetry elements.  It has two main sections:

Examples - This section includes a window that enables the user to observe a number of molecules and their symmetry elements. It also provides explanations about the laws of symmetry and chemical information about the molecules selected for demonstration. The main purpose of this section is to refresh the student's knowledge of the definitions of the various symmetry elements while taking advantage of the Internet to present a three-dimensional and interactive display of molecules and their symmetry elements.

Molecular Symmetry Painter - The Painter is used for online drawing of symmetry elements (axes, planes and points) on three-dimensional molecular structures. A molecular database is provided along with the Painter. Molecules can also be uploaded from the user's computer.

The websites is also linked to the CoSyM website - that allows online calculation of continuous symmetry measures that determine the distance of a distorted molecule from perfect symmetry.

References:

I. Tuvi-Arad and P. Gorsky, New Visualization tools for learning molecular symmetry: A preliminary evaluation, Chemistry Education Research and Practice 8(1), 61-72 (2007).

I. Tuvi-Arad and R. Blonder, Continuous symmetry and chemistry teachers: learning advanced chemistry content through novel visualization tools, Chemistry Education Research and Practice 11(1), 48-58 (2010).

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