Seeks acts as a personalizing Web server or proxy between you and your data feeds. Connect most search engines, RSS/ATOM feeds, Twitter / Identica, Youtube / Dailymotion, Wikis, and basically any source of data, and Seeks will produce a fused personalized batch / stream of results to your queries. Its specific purpose is to regroup users whose queries are similar so they can share both the query results and their experience on these results.
 
The Seeks project consists of A web proxy, A websearch meta search engine that aggregates results and ranks them based on consensus, A plugin system and a set of default plugins, that includes websearch and a URL blocker. A HTTP server plugin, An image websearch plugin.

Seeks acts as a personalizing Web server or proxy between you and your data feeds. Connect most search engines, RSS/ATOM feeds, Twitter / Identica, Youtube / Dailymotion, Wikis, and basically any source of data, and Seeks will produce a fused personalized batch / stream of results to your queries.  Its specific purpose is to regroup users whose queries are similar so they can share both the query results and their experience on these results.

Seeks - An Open Decentralized Platform for Collaborative Search, Filtering and content Curation

JVector is a pure Java, zero dependency, embedded vector search engine, used by DataStax Astra DB.
JVector uses state of the art graph algorithms inspired by DiskANN and related research that offer high recall and low latency. It uses the Panama SIMD API to accelerate index build and queries. It is memory efficient, compresses vectors using product quantization so they can stay in memory during searches.
JVector is concurrent, its index can scale linearly to 32 threads.

JVector - The most advanced embedded vector search engine

Heritrix is the Internet Archive's open-source, extensible, web-scale, archival-quality web crawler project. Heritrix is designed to respect the robots.txt exclusion directives and META robots tags, and collect material at a measured, adaptive pace unlikely to disrupt normal website activity. It provides web interface for operator control and monitoring of crawls. It stores content to ARC or ISO WARC aggregate/transcript format.

Heritrix is the Internet Archive's open-source, extensible, web-scale, archival-quality web crawler project. Heritrix is designed to respect the robots.txt exclusion directives and META robots tags, and collect material at a measured, adaptive pace unlikely to disrupt normal website activity.

Heritrix

ASPseek is an Internet search engine software developed by SWsoft.ASPseek consists of an indexing robot, a search daemon, and a CGI search frontend. It can index as many as a few million URLs and search for words and phrases, use wildcards, and do a Boolean search. Search results can be limited to time period given, site or Web space (set of sites) and sorted by relevance (PageRank is used) or date. ASPseek is optimized for multiple sites (threaded index, async DNS lookups, grouping results by site, Web spaces), but can be used for searching one site as well. ASPseek can work with multiple languages/encodings at once (including multibyte encodings such as Chinese) due to Unicode storage mode. Other features include stopwords and ispell support, a charset and language guesser, HTML templates for search results, excerpts, and query words highlighting.

ASPseek is an Internet search engine software developed by SWsoft.ASPseek consists of an indexing robot, a search daemon, and a CGI search frontend. It can index as many as a few million URLs and search for words and phrases, use wildcards, and do a Boolean search. Search results can be limited to time period given, site or Web space (set of sites) and sorted by relevance (PageRank is used) or date.

ASPseek

Bobo Browse is an information retrieval technology that provides navigational browsing into a semi-structured dataset. Beyond the result set from queries and selections, Bobo Browse also provides the facets from this point of browsing. It provides support to sort documents on fields that have multiple values. It is stable and used by LinkedIn.

Bobo - Faceted search library based on Lucene

PyLucene is a Python extension for accessing Java Lucene. Its goal is to allow you to use Lucene's text indexing and searching capabilities from Python. It is API compatible with the latest version of Java Lucene, PyLucene is not a Lucene port but a Python wrapper around Java Lucene. PyLucene embeds a Java VM with Lucene into a Python process.

PyLucene - Python extension for accessing Java Lucene

Norconex HTTP Collector is a web spider, or crawler that aims to make Enterprise Search integrators and developers's life easier. It is Portable, Extensible, reusable, Robots.txt support, Obtain and manipulate document metadata, Resumable upon failure and lot more.

Norconex HTTP Collector - A Web Crawler in Java

LuMongo is a real-time distributed search and storage system based on Lucene. LuMongo is designed from the ground up to scale both vertically and horizontally across servers. LuMongo stores Lucene indexes directly into MongoDB. Documents can be stored natively into MongoDB. When stored natively document can be queried as normal out of MongoDB and use of Map-Reduce and the Aggregation Framework is possible.

LuMongo - Realtime Time Distributed Search

Para was designed to be a simple and modular backend framework for object persistence and retrieval. It helps you build applications faster by taking care of the backend. It works on three levels - objects are stored in a NoSQL data store or any old relational database, then automatically indexed by a search engine and finally, cached. Para is also multitenant and has a clean and easy-to-use JSON API.

Para - The backend for busy developers

Katta is a scalable, failure tolerant, distributed, data storage for real time access. Katta serves large, replicated, indices as shards to serve high loads and very large data sets. These indices can be of different type. Currently implementations are available for Lucene and Hadoop mapfiles. Its features include:
 <ul>
	<li>Makes serving large or high load indices easy</li>
	<li>Serves very large Lucene or Hadoop Mapfile indices as index shards on many servers</li>
	<li>Replicate shards on different servers for performance and fault-tolerance</li>
	<li>Supports pluggable network topologies</li>
	<li>Master fail-over</li>
	<li>Fast, lightweight, easy to integrate</li>
	<li>Plays well with Hadoop clusters</li>
</ul>

Katta is a scalable, failure tolerant, distributed, data storage for real time access. Katta serves large, replicated, indices as shards to serve high loads and very large data sets. These indices can be of different type. Currently implementations are available for Lucene and Hadoop mapfiles.

Katta - Lucene and more in the cloud.

Compass provides real time searchengine built on top of Lucene. It is distributed, transcational, supports Spring MVC, integrates with ORM. Simple Compass provides a simple API for working with Lucene. If you know how to use an ORM, then you will feel right at home with Compass with simple operations for save, and delete & query. Compass provides google-style search, index updates as well as more advanced concepts such as caching and index sharding (sub indexes). Compass also uses built in optimizations for concurrent commits and merges. It provides support to map	Object, JSON, XML to search engine mapping. It allows storing the index with Data Grid products such as GigaSpaces, Coherence and Terracotta.

Compass is a real time searchengine. It is built on top of lucene. It is transactional, distributed, supports Spring MVC, integrates with Hibernate.    

compass - Searchengine built on top of Lucene

Lucene++ is an up to date C++ port of the popular Java Lucene library, a high-performance, full-featured text search engine.

LucenePlusPlus - C++ port of the popular Java Lucene library

Ferret is an information retrieval library in the same vein as Apache Lucene. Originally it was a full port of Lucene but it now uses it's own file format
and indexing algorithm although it is still very similar in many ways to Lucene. Everything you can do in Lucene you should be able to do in Ferret.

Ferret - The extensible information retrieval library for ruby.

This is a fast text search engine, intended for use with source code. (Pronunciation: roughly as you would pronounce "zooked" in English)


Zoekt - Fast trigram based code search  

searchcode server is a powerful code search engine with a sleek web user interface. searchcode server works in tandem with your source control system, indexing thousands of repositories and files allowing you and your developers to quickly find and reuse code across teams.

searchcode server - The offical home of searchcode-server where you can run searchcode locally

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