Created through a partnership between NASA and the Internet Archive, NASA imagines offers public access to NASA's image, video, and audio collections in a single, searchable resource.
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As of June 2, 2011, all PDF versions of books published by the National Academies Press are downloadable to anyone free of charge.
The National Ocean Service (NOS) studies, monitors, and protects coastaland marine areas in the United States.
19th Century Collections Online is a multi-year global digitization and publishing program focusing on archival collections of primary sources providing full-text, fully searchable content.
This resource is the largest journals package offered by SAGE. It includes international, peer-reviewed journals, including high-impact research titles published on behalf of nearly 300 scholarly and professional societies. Its interdisciplinary coverage is unparalleled, spanning subject areas including business; humanities; social sciences; science, technology, medicine; and many more.
Access over 2,200 peer reviewed academic journals and selected books.
Search back files of Scientific American from 1845 to present.
Scirus searches an international collection of institutional repositories and other resources, so it can be a good way to find technical reports, preprints, and other less common publications.
The SPIE Digital Library contains the world's largest collection of optics and photonics applied research. With more than 445,000 papers spanning biomedicine, communications, sensors, defense and security, manufacturing, electronics, energy, and imaging, the SPIE Digital Library is the most extensive research database available on optics and photonics research.
Synthesis is an engineering and applied science e-books collection from Morgan & Claypool, which synthesizes important engineering research or development topics in lecture series format.