KnowledgeDoor provides tools for students, engineers, and scientists: Over 25,000 cited reference values and the Numerari calculator app with units, complex numbers, and more!

This website is designed to help students learn chemistry and to provide professionals with information of value, by offering an introduction to chemistry, modules on important topics in chemistry, demonstrations of laboratory techniques, NMR spectral data and problems, and more.

Organic Chemistry Resources Worldwide aims to provide a one-stop shop for the specific needs of organic chemists, where reliable, regularly updated information is available at high speed.

ScienceDaily features breaking news about the latest discoveries in science, health, the environment, technology, and more. Visitors can browse more than 500 individual topics, find headlines and summaries of relevant news stories, as well as links to topic-specific RSS feeds and email newsletters.

The National Institute of Standards and Technology Research Library is responsible for creating, maintaining, and disseminating a knowledge base which supports the research and administrative needs required to fulfill scientific, engineering, and technical innovation.

The National Toxicology Program (NTP) is an interagency program within the U.S. Department of Health and Human Services that evaluates and identifies the health effects of select substances which could be hazardous to humans. They seek to maintain an objective, science-based approach to deal with critical issues in toxicology.