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SAO/NASA Astrophysics Data System "The SAO/NASA Astrophysics Data System (ADS) is a Digital Library portal for researchers in Astronomy and Physics, operated by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant. The ADS maintains three bibliographic databases containing more than 10.2 million records."
Science.gov Provides links to a wide variety of scientific resource materials, indexes, and statistics produced by U. S. departments, agencies, and related institutes and labs.
ScienceCinema Highlights leading-edge research from the U.S. Department of Energy as well as the European Organization for Nuclear Research (CERN). Using innovative, state-of-the-art audio indexing and speech recognition technology from Microsoft Research, ScienceCinema allows users to search for specific words and phrases spoken within video files. Simply enter a term in the box and start exploring!
Springer Open "SpringerOpen, launched in June 2010, includes Springer�s portfolio of 200+ peer-reviewed fully open access journals across all areas of science."
Stratigraphy Net [Stratigraphy Net] "Stratigraphy.Net aims to provide free and open access to geoscientific information and data with special emphasis on the disciplines stratigraphy, paleontology and sedimentology."