Distributed NoSQL database with vector search capabilities via Storage-Attached Indexes (SAI) in Cassandra 5.0+. Uses Lucene HNSW for approximate nearest neighbor search. This is an OSS database under Apache 2.0 license.

Microsoft's globally distributed multi-model database with native vector search using DiskANN algorithm. Features <20ms query latency and 43x lower cost vs Pinecone. This is a commercial managed service.

A compact and efficient pre-trained sentence embedding model, widely used for generating vector representations of text. It's a popular choice for applications requiring fast and accurate semantic search, often integrated with vector databases.