Molecular Simulations Incorporated (MSI) home page presents information on its scientific software and chemical-computing products. The page gives access to product details about the Cerius2 software environment, as well as information on the Catalyst and Quanta Life Science product lines. The software tools may be used for protein design, combinatorial chemistry and macromolecular structure determination. The page contains demonstrations of X-ray Crystallography and Nuclear Magnetic Resonance Workbenches as well as links to related genetic, molecular, and chemistry sites.