Best Open-Source Search Engines on GitHub (2026)

Q: What is the best open-source search engines on GitHub?

Based on the RepoRadar scoring engine, elastic/elasticsearch is currently the top-ranked open-source search engines with 77.1k stars and a score of 93/100.

Q: When was this open-source search engines list last updated?

This list was last updated on 2026-06-19. Data is sourced directly from GitHub's public API.

This list contains the top 12 open-source search engines on GitHub, ranked by the RepoRadar scoring engine across five quality dimensions. The top-ranked repo is elastic/elasticsearch with 77.1k stars. Projects span written in Java, C++, Rust, Python. Data last updated 2026-06-19.

Updated 2026-06-19 · 12 repos · Data: GitHub public API

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Free and Open Source, Distributed, RESTful Search Engine

★77.1k ⑂ 25,842 ⚠ 5,844 Java updated 11 hours ago

elasticsearchjavasearch-engine

🔎 Open source distributed and RESTful search engine.

★13.2k ⑂ 2,630 ⚠ 2,911 Java updated 13 hours ago

analyticsapache2fossjava

Open Source alternative to Algolia + Pinecone and an Easier-to-Use alternative to ElasticSearch ⚡ 🔍 ✨ Fast, typo tolerant, in-memory fuzzy Search Engine for building delightful s…

★26.1k ⑂ 907 ⚠ 821 C++ updated yesterday

algoliadatastoreelasticsearchenterprise-search

All Results

Cloud-native search engine for observability. An open-source alternative to Datadog, Elasticsearch, Loki, and Tempo.

★11.3k ⑂ 559 ⚠ 769 Rust updated 13 hours ago

big-datacloud-nativecloud-storagedistributed-tracing

OpenGrok is a fast and usable source code search and cross reference engine, written in Java

★4.9k ⑂ 817 ⚠ 534 Java updated yesterday

codeenginejavamaven

Fast Open-Source Search & Clustering engine × for Vectors & Arbitrary Objects × in C++, C, Python, JavaScript, Rust, Java, Objective-C, Swift, C#, GoLang, and Wolfram 🔍

★4.2k ⑂ 323 ⚠ 97 C++ updated 22 days ago

approximate-nearest-neighbor-searchclusteringdatabasefaiss

An open source, non-profit web search engine

★1.8k ⑂ 88 ⚠ 67 Python updated 13 hours ago

non-profitsearch-engine

The open source code of this project is used for userscripts (油猴脚本) for desktop browsers, including Font Rendering (Customized) (字体渲染（自用脚本）- Font Rendering.user.js), and Search En…

★1.5k ⑂ 70 ⚠ 1 JavaScript updated 9 days ago

font-renderinggreasemonkeygreasyforkjavascript

Diskover Community Edition - Open source file indexer, file search engine and data management and analytics powered by Elasticsearch

★1.8k ⑂ 183 ⚠ 1 PHP updated 2 months ago

crawlerdisk-spacedisk-space-analyzerdisk-usage

🔥 Open Source Perplexity like AI search engine with real-time citations, streaming responses, and live data powered by Firecrawl

★1.9k ⑂ 338 ⚠ 8 TypeScript updated 9 months ago

Open Source research tool to search, browse, analyze and explore large document collections by Semantic Search Engine and Open Source Text Mining & Text Analytics platform (Integr…

★1.2k ⑂ 199 ⚠ 205 Shell updated 1 year ago

annotationfaceted-searchfulltext-searchinvestigative-journalism

Nov 20 2017 -- A distributed open source search engine and spider/crawler written in C/C++ for Linux on Intel/AMD. From gigablast dot com, which has binaries for download. See the…

★1.6k ⑂ 456 ⚠ 96 C++ updated 2 years ago

Frequently Asked Questions

What is the best open-source search engines on GitHub?

Based on the RepoRadar scoring engine, elastic/elasticsearch is currently the top-ranked option with 77.1k stars and a score of 93/100.

How are open-source search engines repositories ranked?

Repositories are ranked by the RepoRadar score — a composite of five dimensions: Popularity (35%), Freshness (25%), Maintenance (20%), Community (10%), and Completeness (10%). Scores range from 0–100.

When was this list last updated?

This list was last updated on 2026-06-19. Data is sourced directly from GitHub's public API. No cached or fabricated repositories are used.

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