Weaviate

Weaviate is an open-source vector database that stores both objects and vectors, combining vector search with structured filtering and cloud-native scalability. The hybrid search specialist handles vector similarity, keyword matching, and metadata filtering natively in a single query. Features fault tolerance, distributed architecture, and real-time indexing. Used for semantic search, RAG pipelines, and recommendation systems. Released under BSD 3-Clause License with 8,000+ GitHub stars.