U.S. Non-Commercial Medical Search Engines

Dr. Claudia Krenz provides search boxes and instructions for eleven specialist search tools, mainly maintained by the National Library of Medicine.
http://www.srv.net/~msdata/US_medsearch.html

Worldhealthcare.net

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

Med411

A medical search engine and portal.
http://www.med411.com/

Med Help International Search

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

Medic8.com

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

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/

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/

Vivísimo ClusterMed

Sends requests to the PubMed search engine and clusters the search results.
http://vivisimo.com/clustermed

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.
http://articlesciences.inist.fr/

Entrez

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

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/

OmniMedicalSearch.com

A medical metasearch engine including various seek options and information tools.
http://www.omnimedicalsearch.com/

Allhealthnet.com

Global medical search engine. Comprehensive source of medical information available on the web.
http://www.allhealthnet.com