Search engine software

global system of interlinked hypertext documents accessed via the Internet

software system that is designed to search for information on the World Wide Web

internet bot that systematically browses the World Wide Web, typically for the purpose of Web indexing (web spidering)

Sci-Hub is a shadow library that provides free access to millions of research papers, regardless of copyright, by bypassing publishers' paywalls in various ways. Unlike Library Genesis, it does not provide access to books. Sci-Hub was founded in Kazakhstan by Alexandra Elbakyan in 2011, in response to the rising costs of research papers behind paywalls. The site is extensively used worldwide. In September 2019, the site's operator(s) said that it served approximately 400,000 requests per day. In addition to its intensive use, Sci-Hub stands out among other shadow libraries because of its easy

search engine for scientific articles and books

Java library for full-text search

Elasticsearch is a source-available search engine developed by Elastic. It is based on Apache Lucene and provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents. Official clients are available in Java, C#, PHP, Python, Ruby, and other languages. According to the DB-Engines ranking, Elasticsearch is the most popular enterprise search engine.

Z-Library (abbreviated as z-lib, formerly BookFinder) is a shadow library project for file-sharing access to scholarly journal articles, academic texts and general-interest books. It began as a mirror of Library Genesis but has expanded dramatically.

open-source enterprise-search platform

matching of some stated user query against a set of free-text records

Kagi ( ) (stylized as kagi) is a paid ad-free search engine developed by Kagi Inc., a company located in Palo Alto, California.

VuFind is an open-source library search engine that allows users to search and browse beyond the resources of a traditional Online public access catalog (OPAC). Developed by Villanova University, version 1.0 was released in July 2010 after two years in beta.

user interface method to search for text

Algolia is a French proprietary search-as-a-service platform, with its headquarters in San Francisco and offices in Paris and London. Its main product is a web search platform for individual websites.

search engine, fork of Elasticsearch

Zedge is a content distribution platform that provides consumers with a way to personalize their mobile devices. It has offices in Trondheim, Vilnius, and New York City.

library catalog