- ACD Labs
- ACS (American Chemical Society)
- Air and Water Chemistry for Kids
- Barcodes Inc. (Organic Chemistry Glossary)
- Bio-Farma
- Chemical Suppliers Directory
- Exclusive Chemistry
- Chemical Education XChange
- Kids Chemistry 101
- Lenntech Periodic Table (English, French, German, Spanish, Dutch)
- National Science Foundation
- Computational Chemistry & Molecular Modeling Support
- Perkin-Elmer
- Synergy Software