» Entrez
   Simultaneously search multiple life sciences databases at the National Center for Biotechnology Information (NCBI).
   http://www.ncbi.nlm.nih.gov/gquery/gquery.fcgi

» Gateway
   The National Library of Medicine Gateway allows users to search in multiple retrieval systems at the U.S. National Library of Medicine.
   http://gateway.nlm.nih.gov/

» Healia
   Personalized consumer health search engine. Using specialized algorithms, it attempts to evaluate the quality of health-related content found on web pages.
   http://www.healia.com/

» Healthline
   Search engine focused on consumer health care and medical information.
   http://www.healthline.com/

» KMLE Medical Dictionary
   Search several resources simultaneously for medical terminology, medical abbreviations, journals, and drug names.
   http://www.kmle.com/

» Med Help International Search
   Consumer medical search engine comprising articles, patient support groups, glossary, and Q&A.
   http://www.medhelp.org/search.htm

» 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.
   http://www.hon.ch/MedHunt/

» Medic8.com
   Directory and medical search engine for healthcare professionals.
   http://www.medic8.com/

» 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.
   http://www.mwsearch.com/

» SearchMedica
   Search engine for medical professionals focusing on clinical research, Medline, evidence-based medicine and other professional medical content.
   http://www.searchmedica.com

» U.S. Non-Commercial Medical Search Engines
   Dr. Claudia Krenz provides search boxes and instructions for specialist search tools, mainly maintained by the National Library of Medicine.
   http://www.claudiax.net/US_medsearch.html

» Vivísimo ClusterMed
   Sends requests to the PubMed search engine and clusters the search results.
   http://clustermed.info/

» Worldhealthcare.net
   A UK based medical search engine providing informative resources from around the globe.
   http://www.worldhealthcare.net/