Open Source Search Engines

The Hibernate projects offer a suite of powerful Java libraries to work with data. It is best known for Hibernate ORM, which provides relational persistence for Java models and is an implementation of the Jakarta Persistence specification. Hibernate projects do not consistently release binaries or documentation to SourceForge anymore. For up-to-date information, refer to the Hibernate website: * Hibernate ORM: https://hibernate.org/orm/ * Hibernate Validator: https://hibernate.org/validator/ * Hibernate Search: https://hibernate.org/search/ That website will also be updated with newer projects, such as Hibernate Reactive.

Hunspell is a spell checker and morphological analyzer library and program designed for languages with rich morphology and complex compounding or character encoding. Hunspell interfaces: Curses, Ispell compatible pipe interface, OpenOffice.org UNO module

Greenstone is a complete digital library creation, management and distribution package created and distributed by the New Zealand Digital Library Project. There are two major versions of the software. Greenstone 3 is under active development, and is recommended for download. We also provide maintenance releases for its forerunner, Greenstone 2. Featured download not what you're looking for? Click "Browse all files" to access binaries and source releases of both versions.

Searx is a free and open source internet metasearch engine that respects your privacy. It aggregates results from over 70 search services, providing accurate, relevant results with absolutely no user tracking or profiling going on. It’s like having your very own private search engine. It has secure, encrypted connections and does not use cookies by default, giving you the assurance that your searches are 100% private and secure. Searx can also be used over Tor, providing you online anonymity. Searx can be easily integrated with any search engine of your choice. Start searching with absolute privacy and peace of mind with Searx!

Select2 is a jQuery-based replacement for select boxes that allows for searching, tagging, pagination of results, remote data sets, and many other useful options. It’s ideal for enhancing native selects in terms of search and interface, easily loading data from JavaScript, paging and working with large datasets and more. Select2 comes with remote data support and built-in full browser support, be it for modern or legacy browsers. Select2 is also fully extensible, with a great selection of plugins and themes you can choose from to customize it to your needs.

CLucene is a C++ port of Lucene: the high-performance, full-featured text search engine written in Java. CLucene is faster than lucene as it is written in C++.

Virtuoso is a scalable cross-platform server that combines Relational, Graph, and Document Data Management with Web Application Server and Web Services Platform functionality.

SpiderFoot is an open source intelligence automation tool. Its goal is to automate the process of gathering intelligence about a given target, which may be an IP address, domain name, hostname or network subnet. SpiderFoot can be used offensively, i.e. as part of a black-box penetration test to gather information about the target or defensively to identify what information your organisation is freely providing for attackers to use against you.

SearXNG is a free and open-source metasearch engine designed to aggregate results from multiple search engines while prioritizing user privacy and anonymity. Instead of maintaining its own index, it queries numerous external search providers and merges the results into a single interface, increasing coverage and diversity of information. One of its core principles is privacy, as it does not track users, store personal data, or create search profiles, making it a strong alternative to traditional search engines. . The system can be self-hosted, allowing individuals or organizations to run their own private search instance with full control over configuration and data handling. It supports extensive customization, including selecting which engines to query, filtering content, and adjusting ranking or display behavior. Developers can also integrate it into other tools through its API, enabling automation and advanced workflows.

Elasticsearch is a distributed, RESTful search and analytics engine that lets you store, search and analyze with ease at scale. It lets you perform and combine many types of searches; it scales seamlessly, and offers answers incredibly fast with search results you can rank based on a variety of factors. Elasticsearch can be used for a wide variety of use cases, from maps and metrics to site search and workplace search, and with all data types.

The Lemur Project develops search engines, browser toolbars, text analysis tools, and data resources that support research and development of information retrieval and text mining software, including the Indri search engine in C++, the Galago search engine research framework in Java, the RankLib learning to rank library, ClueWeb09 and ClueWeb12 datasets and the Sifaka data mining application.

HTML::Index - Perl modules for creating and searching an index of HTML files

Scira is an open source AI-powered search and research assistant designed to provide fast, conversational answers grounded in web and knowledge sources. The project combines a modern web interface with retrieval-augmented generation techniques to deliver responses that are both natural language friendly and evidence oriented. It is built for developers who want to deploy their own Perplexity-style or AI search experience without relying on proprietary hosted services. Scira emphasizes speed, clean UI design, and extensibility so teams can customize data sources, models, and ranking logic. The architecture typically supports real-time querying, streaming responses, and modular backend components. Overall, Scira targets builders who want a self-hosted AI search experience focused on transparency and customization.

VuFind® is a library resource discovery portal designed and developed for libraries by libraries. The goal of VuFind® is to enable your users to search and browse through all of your library's resources by replacing the traditional OPAC.

The stuff here has no documentation and some of it may never be completed. This is my playground, use at your own risk.

Regain is a Java search engine based on Jakarta Lucene. It provides indexing and searching files for plenty of formats (HTML,XML,doc(x),xls(x),ppt(x),oo,PDF,RTF,mp3,mp4,Java). A TagLibrary eases integrating search results in your JSP based web page.

A general purpose source code indexer and cross-referencer that provides web-based browsing of source code with links to the definition and usage of any identifier. Supports multiple languages. Up-to-date information in http://lxr.sourceforge.net

PDFBox is a Java PDF Library. This project will allow access to all of the components in a PDF document. More PDF manipulation features will be added as the project matures. This ships with a utility to take a PDF document and output a text file.

An Award Winning and complete open source seo control panel for managing search engine optimization of your websites. Seo Panel is a seo tool kit includes latest hot seo tools to increase and track the performace of your websites. It is a free software released under GNU GENERAL PUBLIC LICENSE V2. Seo Panel selected as 1st Runner Up in 2011 Open Source Awards as Most Promising Open Source Project. The main feature of seo panel is its extendability by using seo plugins. Any one can easily develop and install required plugins for their seo panel. This open source software was released on January 2010. With in this short period of time thousands of web masters are using this software for optimizing their websites. Use seo panel today itself and enjoy everything related to seo under a single platform. The major feature of seo panel is seo plugins, we can add plugins to our seo panel and extend the features according to our requirement. Home Page: https://www.seopanel.org/

OpenSearch is a distributed search and analytics engine based on Apache Lucene. After adding your data to OpenSearch, you can perform full-text searches on it with all of the features you might expect: search by field, search multiple indices, boost fields, rank results by score, sort results by field, and aggregate results. Unsurprisingly, people often use search engines like OpenSearch as the backend for a search application, think Wikipedia or an online store. It offers excellent performance and can scale up and down as the needs of the application grow or shrink. Its distributed design means that you interact with OpenSearch clusters. Each cluster is a collection of one or more nodes, servers that store your data and process search requests. You can run OpenSearch locally on a laptop, its system requirements are minimal, but you can also scale a single cluster to hundreds of powerful machines in a data center.

The ht://Dig system is a complete indexing and searching system for a domain or intranet. This system is not meant to replace the need for powerful internet-wide search systems like Lycos, Infoseek, Google and AltaVista.

NekoHTML is a simple HTML scanner and tag balancer that enables application programmers to parse HTML documents and access the information using standard XML interfaces.

Google Hacks is a compilation of carefully crafted Google searches that expose novel functionality from Google's search and map services.

PHPLinks is an open source project written in PHP for use with MySQL, allowing one to run an extremely efficient Link Farm with full search capabilities. A "simulated" search engine in many ways.

A torrent search engine plugin for the Azureus/Vuze bittorrent platform.