Provides access to numerical and graphical data on the properties of materials
from the Landolt-Börnstein New Series, the Linus Pauling Files and other integrated resources.
Open chemistry database from the National Institutes of Health (NIH). Includes information on chemical structures, identifiers, chemical and physical properties, biological activities, patents, health, safety, toxicity data, and more.
Free access service providing a structure centric community for chemists. Providing access to millions of chemical structures and integration to a multitude of other online services.