ACD/ChemSketch 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.
Please note that the freeware version of ChemSketch does not include all of the functionality of the commercial version .
MarvinSketch is an advanced chemical editor for drawing chemical structures, queries and reactions. MarvinSpace is a 3D visualization tool for small molecules, proteins, nucleic acids or crystals. MarvinView is an advanced chemical viewer for single and multiple chemical structures, queries, reactions and non chemical data included in the file.