Qdrant - High-performance, massive-scale Vector Database and Vector Search Engine for the next generation of AI. Also available in the cloud https://cloud.qdrant.io/
Weaviate is an open-source vector database that stores both objects and vectors, allowing for the combination of vector search with structured filtering with the fault tolerance and scalability of a cloud-native database.
MTEB: State-of-the-art evaluation of embeddings across languages and modalities
SeekStorm: vector & lexical search - in-process library & multi-tenancy server, in Rust.
A high performance Vector Database leveraging parallel graph computing