PubMed is a database created by the National Library of Medicine to facilitate searching the biomedical literature. The MEDLINE databases found within PubMed contains journals that have been reviewed by a panel of experts for quality. PubMed also contains PMC, which contains publicly accessible literature that have not necessarily gone through the same review process.
The Cochrane Library consists of a collection of regularly updated evidence-based health care databases. The collection is designed to provide information and evidence to support health care decision-making. It includes the Cochrane database of systematic reviews, and databases of clinical trials, and non-Cochrane systematic reviews.
DynaMed Plus is a clinical reference tool containing summaries of diseases and other topics, with information about diagnosis, treatment options, etc. All the information in DynaMed is linked back to the original articles that provided the evidence, and evidence is graded based on the quality of the study methodology and the results. HSL link
A searchable collection of ebooks in medicine and other health sciences, including Stedman's Medical Dictionary. Also offers image and media collections, clinical calculators and converters, evidence alerts, and more.