OpenSearch
OpenSearch Software Foundation (Linux Foundation) · Vector databases
Apache-2.0 search and analytics suite forked from Elasticsearch and Kibana, governed by the OpenSearch Software Foundation
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Qdrant
Qdrant Solutions GmbH · Vector databases
Open-source vector search engine written in Rust with filterable HNSW indexes, sparse and multi-vector support, REST/gRPC APIs and a managed cloud
Apache-2.0Open sourceFreemiumLocalSelf-hostedNov 2, 2026
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