3D Sym Op
This is a great app that helps students see the symmetry in molecules. It allows you to choose a molecule (by name, structure, or point group) and display a 3D rendition of it. You can then have it display the symmetry elements, and/or apply all the symmetry operations.
It is available for both android and apple phones: (probably easier to just search for it)
apple: https://itunes.apple.com/us/app/3d-sym-op/id1067556681?mt=8