Free Version of iHyperChem. This is a very limited version of Professional HyperChem, a well-known molecular modeling program for the Mac, Linux, and Windows.

This free version allows you to create, display, and manipulate molecular structures. It does not allow calculations nor does it have the ability to send computations to a Server Version of Professional HyperChem. Nor does it allow bidirectional transfer of molecules from a Professional HyperChem server as does the Level 1 product.
The molecular systems created on the device are rendered in a variety of ways and can be conveniently rotated, translated, zoomed, etc. HyperChem's traditional selection operation is implemented so that you can explore bond lengths, angles, and torsions as well as other capabilities that selection of a subset of a molecule provides. For example, one can select a side chain and rotate that side chain only.

The iPhone or iPad Touch version is essentially the same as the iPad version except that it allows fewer elements and is restricted to organic molecules.