Advanced Chemistry Development’s ACD/ChemSketch Freeware bundle is the sort of easy-to-use cutting-edge toolkit that chemist Isaac Asimov predicted years ago, only it’s not science fiction but real software you can download today. ACD/ChemSketch is an easy-to-use chemical modeling and rendering program with a versatile 3D viewer that lets you specify everything from shapes and colors to Initial Internuclear Distance (in Angstroms). You can drag and rotate 3D models, zoom in and out, record frames, and manipulate the view in many ways. ChemBasic, a chemistry oriented programming tool, is included.
ACD/ChemSketch Freeware is a drawing package that allows you to draw chemical structures including organics, organometallics, polymers, and Markush structures. It also includes features such as calculation of molecular properties (e.g., molecular weight, density, molar refractivity etc.), 2D and 3D structure cleaning and viewing, functionality for naming structures (fewer than 50 atoms and 3 rings), and prediction of logP. The freeware version of ChemSketch does not include all of the functionality of the commercial version