| Entrez Simultaneously search multiple life sciences databases at the National Center for Biotechnology Information (NCBI). |
| Gateway The National Library of Medicine Gateway allows users to search in multiple retrieval systems at the U.S. National Library of Medicine. |
| Healia Personalized consumer health search engine. Using specialized algorithms, it attempts to evaluate the quality of health-related content found on web pages. |
| Healthline Search engine focused on consumer health care and medical information. |
| KMLE Medical Dictionary Search several resources simultaneously for medical terminology, medical abbreviations, journals, and drug names. |
| Med Help International Search Consumer medical search engine comprising articles, patient support groups, glossary, and Q&A. |
| MedHunt A tool from Health on the Net that searches the full text of 60,000 medical documents. Searches can be narrowed by location or type of source. |
| Medic8.com Directory and medical search engine for healthcare professionals. |
| Medical World Search This tool has the ability to query other search engines, also provides a discussion forum, medical spelling and drug acronym devices. All users must register and pay annual membership fee. |
| Vivísimo ClusterMed Sends requests to the PubMed search engine and clusters the search results. |