Algolia

Elasticsearch

elastic/elasticsearch

Popular

Distributed search and analytics engine on Lucene, widely used for full-text, logs and vector search.

OpenSearch

opensearch-project/OpenSearch

Popular

Apache-licensed fork of Elasticsearch and Kibana, governed by the Linux Foundation's OpenSearch Foundation.

Meilisearch

meilisearch/meilisearch

Fast, typo-tolerant open-source search engine in Rust with hybrid search and simple setup.

Typesense

typesense/typesense

Open-source, in-memory search engine and Algolia alternative with typo tolerance and vector search.

ParadeDB

paradedb/paradedb

Rising

Postgres extensions for Elasticsearch-quality BM25 full-text and hybrid search inside your database.

Vespa

vespa-engine/vespa

Large-scale serving engine combining vector, lexical and structured search with ML ranking.

Manticore Search

manticoresoftware/manticoresearch

Fast SQL-first open-source search engine, a Sphinx successor and lightweight Elasticsearch alternative.

Apache Solr

apache/solr

Legacy

Mature Lucene-based enterprise search platform; still common in legacy enterprise and library systems.

DocSearch

algolia/docsearch

Trending (detected automatically)Popular

Algolia's free crawler-powered search UI for developer documentation sites.