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1. facebookresearch/faiss facebookresearch/faiss Public

   A library for efficient similarity search and clustering of dense vectors.

   C++ 40.5k 4.5k

2. opensearch-project/OpenSearch opensearch-project/OpenSearch Public

   🔎 Open source distributed and RESTful search engine.

   Java 13.5k 2.8k

3. apache/lucene apache/lucene Public

   Apache Lucene open-source search software

   Java 3.5k 1.4k

4. microsoft/DiskANN microsoft/DiskANN Public

   A vector indexing library to bring fast, fresh and filtered search to your database

   Rust 1.9k 432

5. opensearch-project/k-NN opensearch-project/k-NN Public

   🆕 Find the k-nearest neighbors (k-NN) for your vector data

   Java 218 220