- BCO-DMO, Marine Biology data, listed with Marine Sciences repositories.
- Entrez databases, listed under Multidisciplinary repositories.
- Cambridge Structural Database The CCDC is a non-profit, charitable Institution whose objectives are the general advancement and promotion of the science of chemistry and crystallography for the public benefit.
- ChemSpider. Hosted by the Royal Society of Chemistry.
- ChemStar. Maintained by India's National Chemical Laboratory and sponsored by India's Department for Scientific & Industrial Research.
- ChemSynthesis. A database of chemicals and their physical properties.
- ChemXSeer. Hosted by Pennsylvania State University.
- Cooperative Association for Internet Data Analysis (CAIDA) Archive of data for scientific analysis of network functions.
- CrystalEye. From the Unilever Cambridge Centre for Molecular Informatics at the University of Cambridge.
- Crystallography Open Database. A joint project of the Mineralogical Society of America, Mineralogical Association of Canada, European Journal of Mineralogy, International Union of Crystallography, and the US National Science Foundation. Data are in the public domain.
- eCrystals. From the Southampton Chemical Crystallography Group and the EPSRC UK National Crystallography Service.
- NMRShiftDB. For “organic structures and their nuclear magnetic resonance (nmr) spectra.” Distributed nodes from the EBI, University of Mainz and the Max Plank Institute for Chemical Ecology. Data are license with the GNU FDL.
- ChemStar. Maintained by India's National Chemical Laboratory and sponsored by India's Department for Scientific & Industrial Research.
- ioChem-BD Computational Chemistry Datasets(perma.cc). The Computational Chemistry Results Repository.
- Open Notebook Science Solubility Challenge. Maintained by Jean-Claude Bradley, Rajarshi Guha, Andrew Lang and Cameron Neylon. A database of non-aqueous solubility measurements with links to lab notebook pages where experiments were recorded. The database can be searched via Web Query or alternate means.
- PubChem. From the U.S. National Center for Biotechnology Information of the National Institutes of Health (NIH).
- WorldWideMolecularMatrix. “An Open collection of information on small molecules.” From the University of Cambridge.
- ZINC. “A free database of commercially-available compounds for virtual screening.” From the Shoichet Laboratory in the Department of Pharmaceutical Chemistry at the University of California, San Francisco.