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Search engine for natural and physical sciences, social sciences, and humanities. Incorporates arXiv, PubMed, and SciELO. Integrated with ORCID for overlay and peer review services. All articles display Altmetric scores. Free ScienceOpen [135] Scientific Information Database (SID) Engineering, technology, medical science, basic science, human ...
Search engines, including web search engines, selection-based search engines, metasearch engines, desktop search tools, and web portals and vertical market websites ...
The DB-Engines Ranking ranks database management systems by popularity, covering over 410 systems. The ranking criteria [1] include number of search engine results when searching for the system names, Google Trends, Stack Overflow discussions, job offers with mentions of the systems, number of profiles in professional networks such as LinkedIn, mentions in social networks such as Twitter.
IGDB (Internet Games Database) IMDb (Internet Movie Database) INDUCKS; IndexMaster; Informit (database) Inorganic Crystal Structure Database; Interment.net
Database or structured data search (e.g. Dieselpoint). Mixed or enterprise search (e.g. Google Search Appliance ). The largest online directories, such as Google and Yahoo , utilize thousands of computers to process billions of website documents using web crawlers or spiders (software) , returning results for thousands of searches per second.
List of academic databases and search engines; List of biodiversity databases; List of biological databases; List of chemical databases; List of databases for oncogenomic research; List of Drosophila databases; List of genealogy databases; List of long non-coding RNA databases; List of neuroscience databases; List of online databases; List of ...
Most search engines employ methods to rank the results to provide the "best" results first. How a search engine decides which pages are the best matches, and what order the results should be shown in, varies widely from one engine to another. [35] The methods also change over time as Internet usage changes and new techniques evolve.
Web search engines are listed in tables below for comparison purposes. The first table lists the company behind the engine, volume and ad support and identifies the nature of the software being used as free software or proprietary software.