- 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.
- CiteSeer - Search engine for computer science and related matters. For all results number of citations are given which allows to estimate the importance of a paper in a given context. Most of the papers are cached and available for direct download as postscript or PDF.
- ISI Highly Cited - A search tool to identify individuals, departments and laboratories that have made fundamental contributions to the advancement of science and technology in recent decades.
- iSpecies - A species search engine from Rod Page of Glasgow University. Search on either the common or Latin name of a species. Results are generated by querying other data sources.
- Online Journals Search Engine - A multi-search tool that permits queries of a number of scientific journals.
- Scirus - Search engine that fetches only scientific websites.
- SciSeek - Science search engine and directory. Also provides forums, tools and related news.
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