HaptiMOL allows a user to touch a molecule using a haptic device. The solvent accessible surface can be explored by manipulating a probe sphere the size of a water molecule. For more information please see the about pages.
Protein structures can be loaded directly from a PDB file available from the rcsb.org
This software works with devices from SensAble Technologies
Molecules can be viewed in 3D using suitable viewing technology and graphics cards that support Quad Buffer Stereo, such as the Quadro series from nVidia.