1. CHEM-X, Chemical Design Ltd., Oxford, UK
2. INSIGHT, Biosym Technologies Inc., San Diego, CA 92121, USA
3. NEMESIS, Oxford Molecular, Oxford, UK
4. PRO-EXPLORE, Biostructure S.A., 67400 Illkirch-Graffenstaden, France
5. SYBYL, Tripos Corp., St. Louis, MO 63117, USA