Excellent online source for engineers of all disciplines. Extensive directory, educator's resources, free tools, forum, career center, directories, and even textbook rentals.

National Sciences Foundation factsheets on various supported research and design laboratories.

US web site to scientific and engineering information from all appropriate agencies.

Provides links to news sources on a variety of science and technology topics

Engineers’ and buyers’ choice for finding trusted suppliers. The only free platform designed for sourcing components, equipment, raw materials, and manufacturing services. Includes information, products, services, and CAD drawings.

A “computational knowledge engine” devoted to helping to bring together data from disparate sources to solve real-world problem computationally.