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Diagnostic Test Calculator
This calculator can determine diagnostic test characteristics (sensitivity, specificity, likelihood ratios) and/or determine the post-test probability of disease given given the pre-test probability and test characteristics. Given sample sizes, confidence intervals are also computed.
Digital Commons Network™
The Digital Commons Network brings together free, full-text scholarly articles from hundreds of universities and colleges worldwide. Curated by university librarians and their supporting institutions, the Network includes a growing collection of peer-reviewed journal articles, book chapters, dissertations, working papers, conference proceedings, and other original scholarly work.
Directory of Open Access Books
Directory of Open Access Books (DOAB) is a community-driven discovery service that indexes and provides access to scholarly, peer-reviewed open access books and helps users to find trusted open access book publishers. 
Directory of Open Access Journals
The DOAJ (Directory of Open Access Journals) was launched in 2003 with 300 open access journals. Today, this independent database contains over 15 000 peer-reviewed open access journals covering all areas of science, technology, medicine, social sciences, arts and humanities. 
DOAB
Directory of Open Access Books (DOAB) is a community-driven discovery service that indexes and provides access to scholarly, peer-reviewed open access books and helps users to find trusted open access book publishers. 
Drug Information Portal (National Library of Medicine)
The NLM Drug Information Portal is a free resource that searches U.S. government agencies, including the National Library of Medicine, FDA and CDC. Includes current information regarding consumer health, clinical trials, AIDS–related drug information, MeSH® pharmacological actions, PubMed® biomedical literature, and physical properties and structure.
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= Video files