HyperChem Lite is an integrated and flexible molecular modeling product for researchers, educators, and students. It is an easy-to-use yet powerful package with capabilities for visualizing, analyzing, and simulating molecules, and for communicating information about molecular structures.
Lite is a subset of Professional HyperChem and has special dynamic, flexible licensing that is embedded in the product such that a free evaluation copy will take you to a web site where a license can be purchased without ever leaving the executing evaluation copy.