Weaviate — #5 Alternative to Pinecone
Open-source Go vector database with built-in BM25 + vector hybrid search
Weaviate ships out-of-the-box BM25 keyword + dense vector fusion, dynamic tenant offloading to cold object storage, and GraphQL/gRPC query APIs.
License: BSD-3-Clause · Pricing: Open Core · Compare all Pinecone alternatives · Official Website