| Article Sciences | | Scientific article search and order engine, a service provided by Institut de l'Information Scientifique et Technique (INIST) of Centre National de la Recherche Scientifique (CNRS), France. |
| 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. |
| Kosmix | | Categorized search engine for health topics. |
| Med411 | | A medical search engine and portal. |
| 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. |
| Vivsimo ClusterMed | | Sends requests to the PubMed search engine and clusters the search results. |
| Worldhealthcare.net | | A UK based medical search engine providing informative resources from around the globe. |
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