GitHub stars · StarDay

1elastic / elasticsearchFree and Open Source, Distributed, RESTful Search EngineJavaLicense not declared78,515

2searxng / searxngAggregate results from multiple sources through a self-hosted metasearch service.PythonAGPL-3.0 · Share derivative source39,288

3ItzCrazyKns / VaneVane is an AI-powered answering engine.TypeScriptMIT · Permissive38,048

4qdrant / qdrantQdrant - High-performance, massive-scale Vector Database and Vector Search Engine for the next generation of AI. Also available in the cloud https://cloud.qdrant.io/RustApache-2.0 · Permissive35,447

5typesense / typesenseOpen Source alternative to Algolia + Pinecone and an Easier-to-Use alternative to ElasticSearch ⚡ 🔍 ✨ Fast, typo tolerant, in-memory fuzzy Search Engine for building delightful search experiencesC++GPL-3.0 · Share derivative source27,099

6valeriansaliou / sonic🦔 Fast, lightweight & schema-less search backend. An alternative to Elasticsearch that runs on a few MBs of RAM.RustMPL-2.0 · Share derivative source21,379

7xerj-org / xerjAI search engine and MCP server for bots and agents. One Rust binary indexes code, docs, logs, JSONL/CSV and PDFs for BM25 full-text, vector and hybrid search, code search without grep, agent memory and RAG. Elasticsearch-compatible API; Corpus Hub serves hundreds of reference memory corpora.RustApache-2.0 · Permissive18,467

8zincsearch / zincsearchZincSearch . A lightweight alternative to elasticsearch that requires minimal resources, written in Go.GoLicense not declared17,932

9weaviate / weaviateWeaviate is an open-source vector database that stores both objects and vectors, allowing for the combination of vector search with structured filtering with the fault tolerance and scalability of a cloud-native database.GoLicense not declared16,940

10quickwit-oss / tantivyTantivy is a full-text search engine library inspired by Apache Lucene and written in RustRustMIT · Permissive16,404

11alibaba / zvecA lightweight, lightning-fast, in-process vector databaseC++Apache-2.0 · Permissive16,202

12opensearch-project / OpenSearch🔎 Open source distributed and RESTful search engine.JavaApache-2.0 · Permissive13,969

13nextapps-de / flexsearchNext-generation full-text search library for Browser and Node.jsJavaScriptApache-2.0 · Permissive13,817

14searx / searxPrivacy-respecting metasearch enginePythonAGPL-3.0 · Share derivative source13,560

15neuml / txtai💡 All-in-one AI framework for semantic search, LLM orchestration and language model workflowsPythonApache-2.0 · Permissive13,065

16PaddlePaddle / PaddleNLPEasy-to-use and powerful LLM and SLM library with awesome model zoo.PythonApache-2.0 · Permissive12,986

17manticoresoftware / manticoresearchOpen-source search database for full-text, vector, and hybrid search with real-time indexing and SQL.C++GPL-3.0 · Share derivative source12,076

18zaidmukaddam / sciraScira (Formerly MiniPerplx) is a minimalistic AI-powered search engine that helps you find information on the internet and cites it too. Powered by Vercel AI SDK!TypeScriptAGPL-3.0 · Share derivative source11,923

19lancedb / lancedbDeveloper-friendly OSS embedded retrieval library for multimodal AI. Search More; Manage Less.RustApache-2.0 · Permissive11,852

20quickwit-oss / quickwitCloud-native OSS search engine for observabilityRustApache-2.0 · Permissive11,773