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Indexing Libraries & Query Tools

Software for creating and querying data indexes efficiently.

33 projects

41,823 contributors

$641M

Most contributors

Elasticsearch

Elasticsearch is a distributed, RESTful search and analytics engine capable of addressing a growing number of use cases. As the heart of the Elastic Stack, it centrally stores data for lightning fast search, fine‑tuned relevancy, and powerful analytics.

18,348

3,665

$204M

Faiss

Faiss is a library for efficient similarity search and clustering of dense vectors, developed by Facebook Research. It contains algorithms that search in sets of vectors of any size, up to ones that possibly do not fit in RAM. It also includes support for different similarity metrics and various optimization methods for fast and accurate vector search.

2,750

501

$5.2M

Chroma

the AI-native open-source embedding database

2,422

461

$14M

Meilisearch

Meilisearch is an open-source search engine that provides fast, relevant, and typo-tolerant full-text search capabilities. It is designed to be easy to integrate into applications and offers features like instant search results, custom ranking rules, and faceted search.

1,692

480

$7.5M

InstantSearch

⚡️ Libraries for building performant and instant search and recommend experiences with Algolia. Compatible with JavaScript, TypeScript, React and Vue.

1,583

341

$9.4M

mu

mu is an email indexing and search tool that enables fast email search, filtering and organization. It works with Maildirs and supports integration with email clients like Emacs. The tool provides a command-line interface for indexing and searching emails, with features like full-text search, message threading, and attachment handling.

1,329

377

$2.6M

Apache Lucene

Apache Lucene is a high-performance, full-featured text search engine library written in Java. It provides indexing and search technology, as well as spellchecking, hit highlighting and advanced analysis/tokenization capabilities.

1,282

177

$40M

Elasticsearch Curator

Elasticsearch Curator is a maintenance and management tool for Elasticsearch indices that helps users perform administrative tasks like creating, deleting, and managing indices based on time-based patterns, size thresholds, and other configurable criteria.

1,265

376

$1M

Fuse.js

Fuse.js is a lightweight fuzzy-search library that enables powerful searching with approximate string matching and ranking in JavaScript. It allows developers to search through lists and find items even when there are spelling mistakes or partial matches.

1,170

397

$301K

Laravel Scout

Laravel Scout provides a driver based solution to searching your Eloquent models.

1,028

268

$237K

Apache Solr

Apache Solr is an open-source enterprise search platform built on Apache Lucene. It provides distributed indexing, replication, load-balanced querying, automated failover and recovery, centralized configuration, and full-text search capabilities. Solr powers the search and navigation features of many large-scale internet sites.

993

136

$58M

OpenGrok

OpenGrok is a fast and usable source code search and cross reference engine that enables searching and navigating source code repositories. It helps developers understand and analyze code bases by providing features like full text search, cross-referencing, and syntax highlighting.

974

149

$4.7M

Anserini

Anserini is an information retrieval toolkit built on Lucene that provides indexing and search capabilities for academic research and production deployments. It offers efficient implementations of state-of-the-art IR techniques, reproducible research methods, and tools for working with common IR test collections.

919

88

$8M

PgSearch

PgSearch is a Ruby gem that adds full text search capabilities to PostgreSQL databases in Ruby on Rails applications. It provides a simple interface for creating scopes that perform full text search using PostgreSQL's built-in full text search features.

895

285

$183K

Bleve

Bleve is a modern text indexing and search library for Go that provides full-text search capabilities with support for multiple storage engines, rich query types, and faceted search. It enables developers to add search functionality to their Go applications with features like text analysis, term mapping, and scoring.

657

240

$4.5M

Lunr.js

Lunr.js is a lightweight, full-text search library for browser-based applications that enables offline search functionality without external dependencies. It provides features like field-based weighting, fuzzy matching, and stemming while being designed to run entirely on the client side.

656

257

$664K

FlexSearch

FlexSearch is a full-text search library for JavaScript that provides fast and memory-efficient search capabilities with advanced features like fuzzy matching, field-specific search, and customizable indexing strategies

608

208

$3.1M

DocSearch

:blue_book: The easiest way to add search to your documentation.

589

215

$796K

dnGrep

Graphical GREP tool for Windows

427

28

$10M

RoaringBitmap

A better compressed bitset in Java: used by Apache Spark, Netflix Atlas, Apache Pinot, Tablesaw, and many others

343

73

$3.1M

Kernel Memory

Kernel Memory is an AI service and SDK that provides document ingestion, storage, and retrieval capabilities with semantic search and AI reasoning. It enables applications to efficiently process, index, and query documents using natural language, supporting multiple data sources and AI models.

305

46

$825K

emojilib

A comprehensive JSON library containing emoji data including keywords, categories, and annotations to help implement emoji functionality in applications

265

86

$619K

Apache Nutch

Apache Nutch is a highly extensible and scalable open source web crawler framework written in Java. It enables automated fetching, parsing, and data extraction from web pages at scale, with features for distributed crawling, link analysis, and integration with Apache Hadoop for processing large datasets.

221

41

$2.7M

DataWave

DataWave is an ingest/query framework that leverages Apache Accumulo to provide fast, secure data access.

218

20

$34M

Hibernate Search

Hibernate Search: full-text search for domain model

195

41

$18M

Earthdata Search

Earthdata Search is a web application developed by NASA that enables users to search, discover, visualize, and access Earth science data from NASA's Earth Observing System Data and Information System (EOSDIS). It provides a unified interface for browsing and downloading satellite imagery, climate data, and other Earth science datasets.

188

35

$22M

Xapian

Xapian is an open source search engine library that enables probabilistic information retrieval and full-text indexing capabilities. It provides a highly adaptable toolkit for adding intelligent searching to applications, supporting features like relevance-based ranking, boolean queries, and phrase searching.

146

32

$179M

NNTmux

NNTmux is a Usenet indexing application forked from Newznab, designed to help users search, browse and manage Usenet content. It provides features for indexing newsgroups, managing NZB files, and integrating with various Usenet services.

144

16

$4.9M

FTS Xapian

Dovecot FTS plugin based on Xapian

142

32

$103K

photon

Photon is an open-source geocoding engine that converts addresses and place names into geographic coordinates. It provides fast and accurate search functionality for OpenStreetMap data, offering both forward (text to coordinates) and reverse (coordinates to text) geocoding capabilities through a REST API.

69

8

$557K

Apache Lucene and Solr

Apache Lucene and Solr open-source search software

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