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Website. lucene .apache .org. Apache Lucene is a free and open-source search engine software library, originally written in Java by Doug Cutting. It is supported by the Apache Software Foundation and is released under the Apache Software License. Lucene is widely used as a standard foundation for production search applications.
Code search engines. This category is for search engines that search for computer program source code .
Okapi BM25. In information retrieval, Okapi BM25 ( BM is an abbreviation of best matching) is a ranking function used by search engines to estimate the relevance of documents to a given search query. It is based on the probabilistic retrieval framework developed in the 1970s and 1980s by Stephen E. Robertson, Karen Spärck Jones, and others.
Full-text search. In text retrieval, full-text search refers to techniques for searching a single computer -stored document or a collection in a full-text database. Full-text search is distinguished from searches based on metadata or on parts of the original texts represented in databases (such as titles, abstracts, selected sections, or ...
Apache Solr. Solr (pronounced "solar") is an open-source enterprise-search platform, written in Java. Its major features include full-text search, hit highlighting, faceted search, real-time indexing, dynamic clustering, database integration, NoSQL features [2] and rich document (e.g., Word, PDF) handling. Providing distributed search and index ...
Koders. Koders was a search engine for open source code. It enabled software developers to easily search and browse source code in thousands of projects posted at hundreds of open source repositories . On April 28, 2008, it was announced that Black Duck Software would acquire the Koders assets and technologies although the Koders website will ...
mnoGoSearch is a crawler, indexer and a search engine written in C and licensed under the GPL (*NIX machines only) Open Search Server is a search engine and web crawler software release under the GPL. Scrapy, an open source webcrawler framework, written in python (licensed under BSD). Seeks, a free distributed search engine (licensed under AGPL).
Vector space model. Vector space model or term vector model is an algebraic model for representing text documents (or more generally, items) as vectors such that the distance between vectors represents the relevance between the documents. It is used in information filtering, information retrieval, indexing and relevancy rankings.