CiteSeeXr is a scientific literature digital library and search engine that focuses primarily on the literature in computer and information science. It provides improvements in functionality, usability, availability, cost, comprehensiveness, efficiency, and timeliness in the access of scholarly knowledge.
"...the largest medical and bioscience information resource and reference site on the Internet, which provides access to medical and bioscience journals, associations, databases and other medical resources, with more than 35,000 active links."
The Aquatic Plant Information Retrieval System (APIRS) database contains citation and keyword records for scientific articles and reports about uncounted species of aquatic, wetland and invasive plants.
The HEP Literature Database is an index of approximately 500,000 journal papers, preprints, e-prints, technical reports,
conference papers and theses. HEP is managed by the Stanford Linear Accelerator
Center and powered by their SPIRES database platform.
Biography and Genealogy Master Index contains biographical articles appearing in English-language Who's Who-type publications, major biographical dictionaries, subject encyclopedias, handbooks, directories and indexes.
Health Reference Center Academic
provides full text access to nursing, allied health
and medical journals; consumer health magazines; newsletters;
pamphlets; newspaper articles; topical overviews; and reference books.
This is an extensive and well-organized site featuring "high-quality historical resources for teachers and students for free and without advertising," a feat accomplished through partnerships with a variety of museums and archives.
"GlobalHealthFacts.org, a project of the Henry J. Kaiser Family Foundation, provides free, up-to-date and easy-to-access data by country on HIV/AIDS, tuberculosis, malaria, and other key health and socio-economic indicators."
The standard one-volume reference work on Christianity, with over 6000 entries, covering biography, church history, and theology, with bibliographies for most entries. Edited by F. L. Cross, updated 3rd edition by E. A. Livingstone.
Has research resources, such as links to over 100 open access ejournals in the field of education, and "websites for students" with links to careers in art, copyright basics, and interactive activities.