1940's-present; PubMed is a service of the U.S. National Library of Medicine that includes over 20 million citations from MEDLINE and other life science journals for biomedical articles. PubMed includes links to full text articles and other related resources. [This resource is publicly available.] The Library also has access to MEDLINE via Web of Knowledge and via Ovid Medline.
Current; Pubget is a search engine for life sciences PDFs. Pubget makes scientific research easier by simplifying the process of finding, managing and analyzing scientific papers. PubGet provides article-level tools making content discovery, access and copyright management much easier for the user.