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Apache Lucene is an information retrieval API originally implemented in Java. It is a technology suitable for nearly any application that requires full-text search, especially cross-platform. Lucene has been ported to other programming languages including Perl, C#, C++, Python, Ruby and PHP.
Lucene.Net is a source code, class-per-class, API-per-API and algorithmatic port of the Java Lucene search engine to the C# and .NET platform utilizing Microsoft .NET Framework.
Beagle is a desktop-independent service for indexing and searching your data. The Beagle daemon transparently monitors your data and updates the index to reflect any changes. On an inotify-enabled system, these updates (e.g. new files, emails, chat) happen more-or-less in real time. Beagle ... [More]
Tracker is a first class object database, extensible tag/metadata database, search tool and indexer. It can trawl through your hard drive and index existing files and data stores It has been designed from the ground up to be very lightweight (the tracker daemon consumes ~4MB of RAM in typical ... [More]
Sphinx is a full-text search engine, it's a standalone search engine, meant to provide fast, size-efficient and relevant full-text search functions to other applications. Sphinx was specially designed to integrate well with SQL databases and scripting languages.
Xapian is an Open Source Search Engine Library, released under the GPL. It's written in C++, with bindings to allow use from Perl, Python, PHP, Java, Tcl, C#, and Ruby (so far!) Xapian is a highly adaptable toolkit which allows developers to easily add advanced indexing and search facilities ... [More]
Senna is an embeddable fulltext search engine, which you can use in conjunction with various scripting languages and databases. Senna is an inverted index based engine, and combines the best of n-gram indexing and word indexing to achieve fast, precise searches. While senna codebase is rather ... [More]
BlackRay is a relational database system designed to offer performance features commonly associated with search engines. It offers SQL support and sophisticated operational and management features. Load-balancing and operational stability by means of N+1 redundance are included. BlackRay is ... [More]
Key features: Support for http, https, ftp, nntp and news URL schemes. htdb virtual URL scheme for indexing SQL databases. Indexes text/html, text/xml, text/plain, audio/mpeg (MP3) and image/gif mime types natively. External parsers support for other document types, including Microsoft Word ... [More]
An open source full-text search engine and crawler based on best open source technologies: lucene, zkoss, tomcat, poi, pdfbox. Multilingual lemmatization, spellcheck, stop words, synonyms, facet, filters, web crawler, database crawler, local and remote file system crawler, documents indexation ... [More]